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Senior CSE - University of Notre Dame
# Detecting LED Changes with a Raspberry Pi Camera
First off, the code.
## TL;DR
I used OpenCV's Python bindings to process pictures of my slipper batteries on a Raspberry Pi. I schedule that script with a systemd timer to run every minute; it sends me a text via IFTTT if they'... | {} |
# Electric Field Intensity at any point due to an Ideal Dipole
## What is an Electric Field Intensity?
The space around an electric charge in which its influence can be felt is known as the electric field. At a point, the electric field intensity is the force experienced by a unit positive charge placed at that point... | {} |
# Another System of Equations?
Algebra Level 3
$\large{\\ \\ \begin{cases} { a }^{ 4 }+{ ( ab ) }^{ 2 }+{ b }^{ 4 }=900 \\ { a }^{ 2 }+ab+{ b }^{ 2 }=45 \end{cases}}$
Let $$a$$ and $$b$$ be real numbers that satisfy the equation above. Find the value of $$2ab$$.
×
Problem Loading...
Note Loading...
Set Loading..... | {} |
## The LaTeX psalm chant
LaTeX’s output, showing its hyphenation algorithms at work, makes me want to set my bibliography to plainchant:
[19] [20] [21] (./blasius.bbl
Underfull \hbox (badness 1210) in paragraph at lines 13--15
[]\OT1/cmr/m/sc/9 Andreotti, Bruno, Forterre, Yo[]el & Pouliquen, Oliver \OT1/c
mr/m/n/9 2... | {} |
# I Ladder facing a wall
1. Jul 7, 2017
### jasonpeng
Hey everybody. I just took a test where a problem described, "a ladder is leaning against a wall with an angle of A. It has a length L and it weighs mg. Assume no friction against the vertical wall and a frictional coefficient of B, find Ffriction"
My dad, a qua... | {} |
## June 13th, 2021
### On the Baire category theorem and the open mapping theorem
Originally published at 狗和留美者不得入内. You can comment here or there.
Theorem 1 (Baire Category Theorem) Let be a complete metric space.
1. The intersection of a countable collection of open dense sets is dense.
2. is not a countable unio... | {} |
Computing Extremely Accurate Quantiles Using t-Digests
11 Feb 2019 Ted Dunning Otmar Ertl
We present on-line algorithms for computing approximations of rank-based statistics that give high accuracy, particularly near the tails of a distribution, with very small sketches. Notably, the method allows a quantile \$q\$ to... | {} |
## Prealgebra (7th Edition)
Published by Pearson
# Chapter 5 - Section 5.3 - Multiplying Decimals and Circumference of a Circle - Vocabulary, Readiness & Video Check: 3
right zeroes
#### Work Step by Step
When a whole number is multiplied by a power of 10, the number of zeroes in the power of ten are added on the ... | {} |
## Featured resource
### Check the Clues bundle – Any three books
Cooperative group problem-solving cards and activities.,
Members: $63.20 inc.GST Others:$ 79.00 inc.GST
Home > Indigenous Learners > Starting Points > Powerful learners
# Powerful learners
What do you see as the most critical aspect of being a powe... | {} |
# Travelling wave derivation#
A student wants to understand how fast a travelling wave described by $$D(x, t) = A\sin(kx - \omega t)$$ is moving and carries out the following derivation.
$$(1) \quad k = m\omega^{2} \textrm{ so } D(x,t) = A\sin(m\omega^{2}x - \omega t)$$
$$(2) \quad D(x,t) = A\sin(\omega(m\omega x - ... | {} |
Italicize part of single line comment
I want to italicize a part of a single line comment, for example:
string new = old; // new is a *copy* of old
In the above, I want "copy" to be italicized, while keeping what ever formatting the comments already have (i.e. the font size, color, etc...).
I've tried using morede... | {} |
# Finite Horizon Optimal Investment and Consumption with Transaction Costs
@article{Dai2009FiniteHO,
title={Finite Horizon Optimal Investment and Consumption with Transaction Costs},
author={Min Dai and Lishang Jiang and Peifan Li and Fahuai Yi},
journal={ERN: Financial Markets (Topic)},
year={2009}
}
• Published 1 Ma... | {} |
# 2. The lirear map g: R? _ R? is represented by the matrix ~6 A= -6 2 12 -12with respect
##### D1=7 d2=8 Any help would be greatly appreciated. Question 3 Left end (r-0) of a copper rod of length 100mm is kept at a constant temperature of Temp-1 0 a 2 degrees and the right end and sides are in...
d1=7 d2=8 Any help w... | {} |
# 4.3 Binomial distribution (Page 3/29)
Page 3 / 29
## Try it
About 32% of students participate in a community volunteer program outside of school. If 30 students are selected at random, find the probability that at most 14 of them participate in a community volunteer program outside of school. Use the TI-83+ or T... | {} |
## Recursos de colección
1. #### Convergence of the Allen-Cahn equation with constraint to Brakke's mean curvature flow
Takasao, Keisuke
In this paper, we consider the Allen-Cahn equation with constraint. In 1994, Chen and Elliott [9] studied the asymptotic behavior of the solution of the Allen-Cahn equation with con... | {} |
92 views
" S2 is incorrect " mentioned in the solution. But I am not getting True --> false pair.
+1
suppose $X = \left \{ 1,2,3,4,5 \right \}$
P(x) = "x is prime"
Q(x) = "x is non prime"
$\exists x P(x) \rightarrow \exists x Q(x) \Leftrightarrow \exists x\left ( P(x) \rightarrow Q(x) \right )$
now LHS can be tru... | {} |
# Spin and things
1. Oct 16, 2007
### plmokn2
I’ve got a couple of conceptual questions on spin etc, and any help would be appreciated.
First of all reading books (eg. Sakuri) it seems like authors tend to show there’s a homomorphism between the groups SO(3) and SU(2) using Euler angles etc. I know the Pauli matric... | {} |
### Structural Characterization and Electronic Properties Determination by High-Field and High-Frequency EPR of a Series of Five-Coordinated Mn(II) Complexes.
The isolation, structural characterization, and electronic properties of high-spin mononuclear five-coordinated Mn(II) complexes, [Mn(terpy)(X)2] (terpy = 2,2':... | {} |
# Subgroup structure of general linear group:GL(2,3)
Jump to: navigation, search
This article gives specific information, namely, subgroup structure, about a particular group, namely: general linear group:GL(2,3).
View subgroup structure of particular groups | View other specific information about general linear group... | {} |
# 22.3 - SAS Date Informats and Formats
22.3 - SAS Date Informats and Formats
Throughout this lesson so far, we have used the mmddyy8. informat to read in SAS dates. And, we have used the date7. and date9. formats to display SAS dates. In this section, we'll just take a look at a few quick examples to illustrate some... | {} |
Predictive Hacks
# How To Get A Sentiment Score For Words with Naive Bayes
We have provided an example of how to get a sentiment score for words in Python based on ratio frequency. For this example, we will work with the Naive Bayes approach taking into consideration a Twitter dataset that comes with NLTK which has b... | {} |
67KiB, 700x613, EqSwBLCVQAULnkW.jpg
No.12538925
What keeps the earth from permanently rotating 90 degrees so that the poles become the equator? | {} |
# Article
Full entry | PDF (0.3 MB)
Keywords:
second order nonlinear differential equation; oscillatory solution; nonoscillatory solution; coexistence problem
Summary:
Oscillatory properties of the second order nonlinear equation $(r(t)x^{\prime })^{\prime }+q(t)f(x)=0$ are investigated. In particular, criteria for ... | {} |
# Cosine of Supplementary Angle
## Theorem
$\map \cos {\pi - \theta} = -\cos \theta$
where $\cos$ denotes cosine.
That is, the cosine of an angle is the negative of its supplement.
## Proof
$\ds \map \cos {\pi - \theta}$ $=$ $\ds \cos \pi \cos \theta + \sin \pi \sin \theta$ Cosine of Difference $\ds$ $=$ $\ds \p... | {} |
# Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wavelength associated
966 views
closed
Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wavelength associated with the electron revolving around... | {} |
Question
# Having difficulties with signed numbers when it comes to multiplication, division, addition and subtraction. Is there a simpler way to remember how to use the signs in math problems?
Negative numbers and coordinate plane
Having difficulties with signed numbers when it comes to multiplication, division, add... | {} |
# Reference for "topos obtained by adjoining an indeterminate set' theorem
From Lawvere's Continuously variable sets; algebraic geometry = geometric logic:
The following illuminating fact about topoi (long known for the case $\mathsf S$=constant sets) was (conjectured by me and) proved by Gavin Wraith for any base to... | {} |
U
U
Unite Finance
English
Search…
⌃K
# Contractions & UBOND
### 1. "When can I swap $UNITE for$UBOND?"
$UBOND will only become available in the Pit following epochs in which the Time Weighted Average Price (TWAP) of$UNITE is under peg. This means that $UNITE's price will have had to have been under 1$ONE per 1 UNITE... | {} |
# Proving Big-$\Theta$ if and only if Big-$O$ and Big-$\Omega$
Given the definitions of Big-$O$ and Big-$\Omega$, I'd like to prove that $f(n) = \Theta(g(n))$ if and only if $f(n) = O(g(n))$ and $f(n) = \Omega(g(n))$.
Here's what I've come up with, but I'm not sure it's a rigorous proof, or even correct. I'm looking ... | {} |
# Parametric Equation
## Parametric Equation
Equation in which the solutions can be expressed as functions of parameters.
### Examples
• The equation Ax² + Bx + C = 0 is a parametric equation.
Its solutions are $$x_1=\dfrac {-B+\sqrt {B^{2}-4AC}} {2A}$$et $$x_2=\dfrac {-B-\sqrt {B^{2}-4AC}} {2A}$$.
• The equation y... | {} |
# General question about ang momentum throug word problem
1. Dec 1, 2011
### Miike012
a person with mass m stands at the outer edge of a round platform whose radius is r and whose mass is m2. the platform is rotating at a speed of ...rad/s. Assuming the platform to be a free rotating disk, what would be its angular ... | {} |
# Vim, Thoughts After Two Weeks
Purposefully, I began using Vim during a non-strenuous work week which helped manage frustration. I have been using solely Vim as a text editor for two weeks and have experienced improved efficienies over my previous text editor, Sublime.
##### Improvments
The ability to change betwee... | {} |
## Chrome Plated Education
How can we expose more people to critical thinking?
Rob Lister
Posts: 22426
Joined: Sun Jul 18, 2004 7:15 pm
Title: Incipient toppler
Location: Swimming in Lake Ed
### Chrome Plated Education
I happened across a slashdot article guiding me to an opensource article about some guy starting s... | {} |
# Does showing a problem and its complement are not Turing-decidable means that the language & its complement are not Turing-recognizable?
I was reading the Sipser's book on the Theory of Computation, 3rd edition and came up with a question. "Does showing a problem and its complement are not Turing-decidable means tha... | {} |
## wtorek, 20 marca 2018
### Solving for Quadratic Equation with TensorFlow and Custom C++ Code
Let's just start with what is our problem. The problem we want to solve is to find quadratic equation's $Ax^2 + Bx + C$ coefficients $A$, $B$ and $C$ that best approximate a given set of 2D points $(x, y)$. This is a linea... | {} |
### by Graham Williams
##### CTAN Edition
newclude New \include system for LaTeX. New \include system for LaTeX. A LaTeX package providing a backwards-compatible reimplementation of \include and \includeonly. The restriction that \clearpages must surround an included file are removed, as is the restriction that \inc... | {} |
Find all School-related info fast with the new School-Specific MBA Forum
It is currently 07 Feb 2016, 20:45
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
C... | {} |
# Differentitation - Why open set?
1. Sep 21, 2008
### thejinx0r
Hey guys,
why is it that when we define $$f:U\subset R^n \rightharpoonup R^m$$, why does U have to be open?
what happens if it's closed?
Thanks
2. Sep 21, 2008
### HallsofIvy
I am a bit confused. Your title is "Differentiation- Why open set?" but ... | {} |
#### A block of mass 10 kg, moving in x direction with a constant speed of 10 ms-1, is subjected to a retarding force F = 0.1 x J/m during its travel from x = 20 m to 30 m. Its final KE will be: Option 1) 275 J Option 2) 250 J Option 3) 475 J Option 4) 450 J
As we discussed in
Net work done by all the forces give the... | {} |
Note: Axiomatic Derivation of the Doppler Factor and Related Relativistic Laws
Open Access Publications from the University of California
## Note: Axiomatic Derivation of the Doppler Factor and Related Relativistic Laws
• Author(s): Falmagne, Jean-Claude
• Doignon, Jean-Paul
• et al.
Abstract
The formula for the rel... | {} |
# A cost-utility analysis of cervical cancer vaccination in preadolescent Canadian females
Title: A cost-utility analysis of cervical cancer vaccination in preadolescent Canadian females Anonychuk, Andrea M; Bauch, Chris T.; Merid, Maraki Fikre; Van Kriekinge, Georges; Demarteau, Nadia Background: Despite the fact th... | {} |
Orientation of the Ferroelectric Hysteresis Loop -- Why is it different now?
• A
Summary:
Sawyer & Tower's orig hysteresis loops are mirrored from those reported today. Why?
Main Question or Discussion Point
(Edited with suggestions from Berkeman)
After reading the original 1930 paper by Sawyer and Tower (link to... | {} |
# Why is dilution exothermic?
The breaking of bonds usually absorbs energy and forming bonds usually releases energy.
Then, why is the dilution of acids and bases exothermic?
• Except when it is endothermic; I have water soluble fertilizer that is strongly endothermic. – blacksmith37 Dec 10 '20 at 16:49
Dissolution... | {} |
## Thomas' Calculus 13th Edition
$n \geq 26$
Consider the error bound for the Trapezoidal Rule as follows: $|E_T| \leq \dfrac{M(b-a)^3}{12n^2}$ The maximum value of $|f^{2}(x)|$ on $[0,1]$, $M=8$ Now, $|E_T| \leq \dfrac{8(1-0)^3}{12n^2}=\dfrac{2}{3n^4}$ We will choose $n$ such that $\dfrac{2}{3n^2} \leq 10^{-3}$ So, $... | {} |
GMAT Question of the Day - Daily to your Mailbox; hard ones only
It is currently 23 Feb 2019, 07:59
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customize... | {} |
location: Publications → journals
Search results
Search: All articles in the CJM digital archive with keyword contraction
Expand all Collapse all Results 1 - 2 of 2
1. CJM 2013 (vol 67 pp. 132)
Clouâtre, Raphaël
Unitary Equivalence and Similarity to Jordan Models for Weak Contractions of Class $C_0$ We ob... | {} |
## Introduction
The mechanical exfoliation of atomically thin nanomaterials has initiated a new research field1. Since then, in particular transition metal dichalcogenides (TMDs) have been intensively studied2,3,4. The family of these truly two-dimensional materials exhibits a strong Coulomb interaction giving rise to... | {} |
# Maclaurin series for $\sin x \cos x$
What is the Mauclarin series for $\sin x \cos x$? I would think that you could just multiply out the representation for $\sin x$ with the representation for $\cos x$, but that's apparently wrong.
If I start multiplying it out and differentiating I'll get some nasty derivatives. ... | {} |
# Kerodon
$\Newextarrow{\xRightarrow}{5,5}{0x21D2}$ $\newcommand\empty{}$
Remark 2.5.9.5. Let $\operatorname{\mathcal{C}}$ be a differential graded category, let $X$ and $Y$ be objects of $\operatorname{\mathcal{C}}$, and let $f,g: X \rightarrow Y$ be morphisms from $X$ to $Y$ in the underlying category $\operatornam... | {} |
I do not know if this is the right place to ask the following question, but couldn't find the answer anywhere else either. So please delete the question if it is out of scope for this community.
I have a question which I asked on MMSE some time back. Today I went to one of the answers and tried to add a comment to whi... | {} |
## Graphs of Logarithmic Functions
### LEARNING Outcomes
• Identify the domain of a logarithmic function
• Graph logarithmic functions
Before working with graphs, we will take a look at the domain (the set of input values) for which the logarithmic function is defined.
Recall that the exponential function is define... | {} |
# 15.1 The first law of thermodynamics (Page 7/10)
Page 7 / 10
## Section summary
• The first law of thermodynamics is given as $\Delta U=Q-W$ , where $\Delta U$ is the change in internal energy of a system, $Q$ is the net heat transfer (the sum of all heat transfer into and out of the system), and $W$ is the net ... | {} |
# Reduced row echelon form of matrix with trigonometric expressions
I'm trying to solve for the eigenvalues of and the eigenvectors of a rotation matrix (about the z-axis):
$$A = \begin{bmatrix} \cos\theta & -\sin\theta & 0 \\ \sin\theta & \cos\theta & 0 \\ 0 & 0 & 1 \end{bmatrix}$$
Using $\det (\lambda I - A) = 0$,... | {} |
# Math Help - Orthonormal Conjugate Quadrature Filter, Fourier Transform
1. ## Orthonormal Conjugate Quadrature Filter, Fourier Transform
This question is strange enough so I'm beginning to suspect a typo/misinterpretation.
Let $w$ be defined by
$\hat{w}=\{ \begin{array}{c}
1 \text{ if } \xi \in (0.5,1] \\
-1 \text{... | {} |
# Definition:Concatenation of URM Programs
## Definition
Let $P$ and $Q$ be URM programs.
The concatenation of $P$ and $Q$ is denoted $P * Q$.
It consists of program $P$ followed immediately by program $Q$.
If $P$ and $Q$ compute particular functions, then it is usually necessary to make modifications to either $P... | {} |
# 3.4: Forecasting
Suppose that the variables $$X_1,\ldots,X_n$$ of a weakly stationary time series $$(X_t\colon t\in\mathbb{Z})$$ have been observed with the goal to predict or forecast the future values of $$X_{n+1},X_{n+2},\ldots$$. The focus is here on so-called one-step best linear predictors (BLP). These are, b... | {} |
# euclidean distance formula in data mining
January 12, 2021 4:38 am Leave your thoughts
In a Data Mining sense, the similarity measure is a distance with dimensions describing object features. Age and Loan are two numerical variables (predictors) and Default is the target. Normalization, which scales all numeric var... | {} |
# The hazard of concealing risk
Review of Man-made Catastrophes and Risk Information Concealment: Case Studies of Major Disasters and Human Fallibility by Dmitry Chernov and Didier Sornette (Springer).
I have recently begun to work on the problem of information hazards: when spreading true information is causing dang... | {} |
# GRE Physics GR 1777 Problem Solution¶
## 034. Relativity (Length Contraction)¶
### You should know¶
$$\large L = L_0 \sqrt{1-(v/c)^2}$$
### Solution¶
A rod measures 1.00 m in its rest system. To make it 0.80 m, an observer must move parallel to the rod at a speed of
$$\large 0.8 = 1.0 \sqrt{1 - (v/c)^2}$$$$\lar... | {} |
Mathematics
ItachiUchiha:
i have two questions
ItachiUchiha:
TurtlePrincess:
Sure, ill see if i can help :)
ItachiUchiha:
ok thanks
TurtlePrincess:
ok so to solve the first one do you know how to solve exponets?
ItachiUchiha:
i think i times them by the base number
TurtlePrincess:
ItachiUchiha:
blocked
Tu... | {} |
ID 757211
Date 7/23/2021
Public
## Controlling Size and Position of Windows
SETWSIZEQQ and GETWSIZEQQ set and get the size and position of the visible representation of a window. The positions and dimensions of visible child windows are expressed in units of character height and width. The position and dimensions of ... | {} |
## Analysis and approximation of conservation laws with source terms.(English)Zbl 0888.65100
A new Lax-type formula for the solution of Riemann problems is derived for conservation laws $$u_t+ f(u)_x= a_x$$ with $$f$$ being an even convex function and $$a(\cdot)$$ a bounded piecewise smooth source term. For fixed sour... | {} |
Hardcover | ISBN: 9780262026024 | 336 pp. | 6 x 9 in | 13 illus.| August 2006
Paperback | $29.00 Short | £19.95 | ISBN: 9780262524612 | 336 pp. | 6 x 9 in | 13 illus.| August 2006 Ebook |$21.00 Short | ISBN: 9780262254717 | 336 pp. | 13 illus.| August 2006
## Analyzing International Environmental Regimes
From Case St... | {} |
easy clustered standard errors in r
# easy clustered standard errors in r
jaket kulit pria visit back LOL. Statmethods - Data mgmt, graphs, statistics. SE by q 1+rxre N¯ 1 were rx is the within-cluster correlation of the regressor, re is the within-cluster error correlation and N¯ is the average cluster size. The com... | {} |
Projects / References for TeX and Friends
# References for TeX and Friends
References for TeX and Friends is an ongoing project which provides a help file for LaTeX (and its friends like ConTeXt, Metapost, Metafont, etc.) using a state-of-the-art source format, DocBook/XML. Various output formats can be generated fro... | {} |
Formats
Format
BibTeX
MARC
MARCXML
DublinCore
EndNote
NLM
RefWorks
RIS
### Abstract
This research examines cash forward contracting of fed cattle. For an individual feeder, a cash contract eliminates basis risk (as compared to a futures hedge). However, the disadvantage is that the contract price is estimated to be l... | {} |
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Event generator tunes obtained from underlying event and multiparton scattering measurements
V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, E Asilar, T Bergauer, ...
The European Physical Journal C 76 (3), 1-52, 2016
3958*2016
Precise determ... | {} |
# subsection and subsubsection aren't working in elsevier template
I am working on Elsevier template with a single column format, I am facing an issue with subsections and subsubsections as they are displayed like a normal section with wrong numbering, for example
\documentclass[a4paper,fleqn]{cas-sc}
\usepackage{flo... | {} |
# Probability Of 2/3 observations being >= 2 standard deviations in a set of observations
I'm using statistical process control charts where the values of the first n observations provide an average and standard deviation, and the position of the subsequent observations relative to those values highlights any variatio... | {} |
Consider an Ice Cube of Edge 1.0 Cm Kept in a Gravity-free Hall. Find the Surface Area of the Water When the Ice Melts. Neglect the Difference in Densities of Ice and Water. - Physics
Short Note
Consider an ice cube of edge 1.0 cm kept in a gravity-free hall. Find the surface area of the water when the ice melts. Neg... | {} |
$\newcommand{\defeq}{\mathrel{\mathop:}=}$
## 2008/05/03
### Fractals
It suddenly occurs to me that fractals may be modelled as a special kind of coinductive datatypes!
--
Charming!
Labels: | {} |
# randomIdeal -- randomIdeal made from a given set of monomials
## Synopsis
• Usage:
I = randomIdeal(L,m)
• Inputs:
• L, a list, or sequence of positive integers
• m, , 1xn matrix of homogeneous polynomials in a ring S
• Outputs:
• I, an ideal, generated by random linear combinations of degrees given by L of the give... | {} |
# WisconistanMarch 1, 2011 12:14 PM Subscribe
Wisconsin has had some record breaking protests in the past week, with hundreds occupying the capitol building full time, even setting up a small village, with support provided from around the world. Some even got married.
The Wisconsin State constitution guarantees acc... | {} |
# Unable to send data to Thingspeak using ESP8266 and STM32 Nucleo
I am using ARM's mbed compiler to program my STM32 Nucleo. I am also using an ESP8266 as my WiFi module.
My connections are as such:
• Rx of the ESP8266 is connected to D8 on the Nucleo.
• Tx of the ESP8266 is connected to D2 on the Nucleo.
• Gnd of ... | {} |
-2 sin x cos x. du/dx = - sin 2x. Circumference Worksheets. u = 1 + cos 2 x. Differentiate the function "u" with respect to "x". If a and b are equal, then min{a,b} is just a (or b). Find the gradient of the curve at a given point. Polynomials Only Number Pattern Worksheets Based on Fibonacci Sequences These number pat... | {} |
# Transforming distributions with Normalizing Flows
Probability distributions are all over machine learning. They can determine the structure of a model for supervised learning (are we doing linear regression over a Gaussian random variable, or is it categorical?); and they can serve as goals in unsupervised learning,... | {} |
## Tuesday, December 09, 2014 ... /////
### Gold: a 6000-year-old bubble
On November 30th, 2014, Switzerland held three referenda.
Spoilers alert: all of the results were "No".
It's funny I told you the results before I explained what the questions were. One of the proposals demanded the Swiss National Bank to hold... | {} |
Investing builds wealth. Holding cash doesn’t. While this is a radical simplification, it reflects a core investing principle: Over the long term, the more you have in the market, the more opportunity you have to earn returns.
Or, to put it another way: if you’ve allocated money for investment, then all of that money ... | {} |
# Does this prove that no sequential squares have a ratio of 2?
The goal: Prove that there is no integer $k$ such that ${(k+1)^2\over{k^2}}=2$.
My proof: If ${(k+1)^2\over{k^2}}=2$, then ${{k+1}\over{k}}=\sqrt2$, and if $k$ is an integer, $k+1$ is also an integer. This implies that $\sqrt2$ is a rational number, whic... | {} |
# Turbine-your-self
Ok. I just canceled my order for a wind turbine. I just cant spend a $1000 with out spending$250 to see if I can do it myself.
I have no problem paying \$250 for an education. With everything I have to pull from, I am confident I will create something....educational.
Any ideas or tips for what to... | {} |
TLDR: don’t use env vars in class constructors.
Seeing environment variables in a class constructor is a code smell and an anti-pattern.
For example in TypeScript for Node.js, you might see something like this:
Anti-pattern:
class Foobar {
private niceInjectableDependency: IDependency;
private importantConfig: str... | {} |
Desolve System Rk4
## Description
We can also use the RK4 method to numerically solve systems of differential equations. Consider the predator-prey system
(1)
\begin{align} x' &= 2x - xy\\ y' &= -5y + xy \end{align}
As a nonlinear system, it is difficult, if not impossible, to find an analytical solution. However, ... | {} |
On Windows, it’s possible to create new “protocol handlers” so that URLs like ssh://hostname, telnet://hostname, etc. are recognized and launch some application (e.g., PuTTY). The only trickery is that Windows will pass the entire protocol string to the application (e.g., PuTTY will be launched with the command line pu... | {} |
# AP Physics 1
## Find the Total Work Done on an Object
Two boys pull a block along the floor for a distance of 4.0 m toward the east. One boy pulls with a force F1 ( magnitude 75 N )
and the other pulls with F2 ( also magnitude 75 N). A friction force fr ( magnitude 25 N ) opposes the motion. Find the following:
a) ... | {} |
# How to use cross validation to estimate autocorrelation?
I have a stationary time series and I want to calculate the autocorrelation coefficient of order 1. For that I use OLS. I know the autocorrelation parameters change over the time. Thus it is not trivial to fix a window length for the regression. Moreover I can... | {} |
2014
01-04
# Cross The River
Most of you may have played the game called crossing the river. This game is: a farmer carries a wolf, a sheep and a basket of grass to cross a river , but only one boat can be used . And everytime ,at most one thing and the farmer can take the boat to cross the river because only th... | {} |
# Basic calculus question
Let $f$ be a bounded continuous function on $[a,b]$. Prove $f$ attains its max and min on $[a,b]$; there exists $x_0$, $y_0 \in [a,b]$ such that $f(x_0) \leq f(x) \leq f(y_0)$ for all $x \in [a,b]$.
Proof: I already got the part of the maximum. In other words that $f$ attains its max at $M =... | {} |
# You've isolated an interesting new channel gene (named vault76) from the Schorchbeast Queen that has the following predicted membrane topology:You
###### Question:
You've isolated an interesting new channel gene (named vault76) from the Schorchbeast Queen that has the following predicted membrane topology: You hope... | {} |
# Why does this limit exist $x^{x}$
I was wondering what is the value of $\lim\limits_{x\to 0+} x^{x}$.
Assuming that the limit exists, I could show using the usual logarithm techniques that the limit is $1$. However, I am not able to show that the limit exists. Could some one help on that?
EDIT: It would be so nice... | {} |
# Distributions.jl - pdf() for Continuous Uniform Distribution
Hello,
I’m taking a free online course in Bayesian Statistics (I have no background in this ) and I’m trying to work through the course with Distributions.jl (and eventually Turing.jl) so that I can learn all of these things together. I’ve run into an iss... | {} |
# MultiDoc
Deutsch (de) English (en) español (es) français (fr) português (pt)
MultiDoc is a Lazarus component to replace the standard MDI interface.
This component permit to write pseudo-MDI application with Lazarus. It is not a real implementation of the MDI interface but it give to your application the capability... | {} |
# Solve log52 (x-3) = x
1. Oct 3, 2013
### Acnhduy
1. The problem statement, all variables and given/known data
log52 (x-3) = x
2. Relevant equations
log laws
3. The attempt at a solution
One of my friends came up with this equation and asked me to graph it. I haven't seen an equation like this, and do not know h... | {} |
Volume 24, Issue 2
High Resolution Schemes for Conservation Laws and Convection-Diffusion Equations with Varying Time and Space Grids
DOI:
J. Comp. Math., 24 (2006), pp. 121-140.
Published online: 2006-04
Preview Full PDF 77 1705
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• Abstract
This paper presents a class of high resolution l... | {} |
# Earth Mover's Distance EMD() results in memory access error
Hello,
i am trying to compute the Earth Mover's Distance using opencv's function EMD(). For most of my signatures that works fine. But for others i get an memory access error which i do not understand. At first i thought maybe the signature matrices were t... | {} |
How to calculate alpha for n channels, so the sum equals 1 (100% coverage)?
Having "n" number of overlaying channels (bitmaps in the same place, layers etc.) how to calculate required alpha for each of them, so they "hide" background completely?
Each layer can have equal value, sum should be exactly 1 ("full alpha").... | {} |
## Mathematics
### Geometry
Geometry (from Ancient Greek: geo, "earth", and metria, "measure") is a branch of Mathematics dealing with issues related to shape, relative position and properties of figures in a given space. Geometry arose naturally and independently in several ancient cultures. During a long period of ... | {} |
# Show that $\frac{te^t}{e^{2t}-1}$ is integrable?
How to show that the function $f\mapsto\dfrac{te^t}{e^{2t}-1}$ is integrable on $(0,+\infty)$ ?
I think it suffices to say that $f\mapsto\dfrac{te^t}{e^{2t}-1}$ is well-defined and continuous on $(0,+\infty)$, then it is continuous, right? My colleague told me that i... | {} |
# Indices and ranges
Ranges and indices provide a succinct syntax for accessing single elements or ranges in a sequence.
In this tutorial, you'll learn how to:
• Use the syntax for ranges in a sequence.
• Implicitly define a Range.
• Understand the design decisions for the start and end of each sequence.
• Learn sce... | {} |
# Tag Info
1
In various branches of mathematics it turns out to be profitable to shift attention from what some objects are to what they do. In case of functions, we shift attention from (locally integrable) functions $f$ being some set of ordered pairs, etc to what it does: it defines a linear functional on the set ... | {} |
# Calculate the Pitch of a projectile with moving destination
Tags:
1. Feb 20, 2015
### Wietlol
Hi all.
I am not quite sure if this is the right forum to place this question but for me there are several forums that would fit with my situation :D
I am making a game where I have to throw/shoot a projectile through a... | {} |
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