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🎉 [update] Center align main title in README files
Browse files- README.md +37 -36
- README_CN.md +36 -34
README.md
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size_categories:
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- 100M<n<1B
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---
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# Ramsey Graph
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<div align="center">
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[](https://opensource.org/licenses/MIT)
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[](https://huggingface.co/datasets/linxy/RamseyGraph)
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[](https://linxueyuan.online/RamseyGraph)
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</div>
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This repository hosts graphs related to the classical **Ramsey Numbers**. You can access them using the following code:
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```bash
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pip install datasets
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```
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```python
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>>> from datasets import load_dataset
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>>> dataset = load_dataset("linxy/RamseyGraph", "r44_3", trust_remote_code=True)
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>>> for i in dataset["train"]:
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>>> print(i)
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{'edges': [], 'num_nodes': 3}
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{'edges': [[1, 2]], 'num_nodes': 3}
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{'edges': [[0, 2], [1, 2]], 'num_nodes': 3}
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{'edges': [[0, 1], [0, 2], [1, 2]], 'num_nodes': 3}
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```
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`r44_3` refers to Ramsey(4,4) graphs with 3 vertices. Here are all dataset names:
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```python
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['r34_1', 'r34_2', 'r34_3', 'r34_4', 'r34_5', 'r34_6', 'r34_7', 'r34_8',
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'r35_1', 'r35_2', 'r35_3', 'r35_4', 'r35_5', 'r35_6', 'r35_7', 'r35_8', 'r35_9', 'r35_10', 'r35_11', 'r35_12', 'r35_13',
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'r36_1', 'r36_2', 'r36_3', 'r36_4', 'r36_5', 'r36_6', 'r36_7', 'r36_8', 'r36_9', 'r36_10', 'r36_11', 'r36_12', 'r36_13', 'r36_14', 'r36_15', 'r36_16', 'r36_17',
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'r37_21', 'r37_22',
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'r38_27',
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'r39_35',
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'r44_1', 'r44_2', 'r44_3', 'r44_4', 'r44_5', 'r44_6', 'r44_7', 'r44_8', 'r44_9', 'r44_10', 'r44_11', 'r44_12', 'r44_13', 'r44_14', 'r44_15', 'r44_16', 'r44_17',
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'r45_24',
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'r46_35some',
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'r55_42some']
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```
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# Introduction
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| A 6-vertex Ramsey(4, 4) graph and its complement |
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| --------------- |
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|  |
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@@ -84,9 +51,43 @@ If you are interested in this topic, you can try to find the **largest Ramsey(5,
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| 9 | - | - | - | - | - | - | - | - | 565 - 5366 | 581 - 9797 |
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| 10 | - | - | - | - | - | - | - | - | - | 798 - 17730 |
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## Progress
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Many Ramsey graphs have been found, but many remain undiscovered. Here are some known Ramsey graphs:
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| Vertices | Ramsey(3,4) | Ramsey(3,5) | Ramsey(3,6) | Ramsey(4,4) Graphs |
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| ------ | ------------------------ | -------------------------- | ------------------------------------------- | -------------------------------------------- |
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size_categories:
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- 100M<n<1B
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---
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<div align="center">
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<h1>Ramsey Graph</h1>
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[](https://opensource.org/licenses/MIT)
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[](https://huggingface.co/datasets/linxy/RamseyGraph)
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[](https://linxueyuan.online/RamseyGraph)
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</div>
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| A 6-vertex Ramsey(4, 4) graph and its complement |
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| --------------- |
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|  |
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| 9 | - | - | - | - | - | - | - | - | 565 - 5366 | 581 - 9797 |
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| 10 | - | - | - | - | - | - | - | - | - | 798 - 17730 |
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+
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## How to Use
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This repository hosts graphs related to the classical **Ramsey Numbers**. You can access them using the following code:
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```bash
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pip install datasets
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```
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```python
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>>> from datasets import load_dataset
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>>> dataset = load_dataset("linxy/RamseyGraph", "r44_3", trust_remote_code=True)
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>>> for i in dataset["train"]:
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>>> print(i)
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{'edges': [], 'num_nodes': 3}
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{'edges': [[1, 2]], 'num_nodes': 3}
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{'edges': [[0, 2], [1, 2]], 'num_nodes': 3}
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{'edges': [[0, 1], [0, 2], [1, 2]], 'num_nodes': 3}
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```
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+
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`r44_3` refers to Ramsey(4,4) graphs with 3 vertices. Here are all dataset names:
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```python
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['r34_1', 'r34_2', 'r34_3', 'r34_4', 'r34_5', 'r34_6', 'r34_7', 'r34_8',
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'r35_1', 'r35_2', 'r35_3', 'r35_4', 'r35_5', 'r35_6', 'r35_7', 'r35_8', 'r35_9', 'r35_10', 'r35_11', 'r35_12', 'r35_13',
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'r36_1', 'r36_2', 'r36_3', 'r36_4', 'r36_5', 'r36_6', 'r36_7', 'r36_8', 'r36_9', 'r36_10', 'r36_11', 'r36_12', 'r36_13', 'r36_14', 'r36_15', 'r36_16', 'r36_17',
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'r37_21', 'r37_22',
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'r38_27',
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'r39_35',
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'r44_1', 'r44_2', 'r44_3', 'r44_4', 'r44_5', 'r44_6', 'r44_7', 'r44_8', 'r44_9', 'r44_10', 'r44_11', 'r44_12', 'r44_13', 'r44_14', 'r44_15', 'r44_16', 'r44_17',
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'r45_24',
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'r46_35some',
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'r55_42some']
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```
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## Progress
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Many Ramsey graphs have been found, but many remain undiscovered. Here are some known Ramsey graphs (also available in `data/` directory):
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| Vertices | Ramsey(3,4) | Ramsey(3,5) | Ramsey(3,6) | Ramsey(4,4) Graphs |
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| ------ | ------------------------ | -------------------------- | ------------------------------------------- | -------------------------------------------- |
|
README_CN.md
CHANGED
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@@ -7,10 +7,11 @@ language:
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size_categories:
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- 100M<n<1B
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---
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-
# Ramsey Graph
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<div align="center">
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[](https://opensource.org/licenses/MIT)
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[](https://huggingface.co/datasets/linxy/RamseyGraph)
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[](https://linxueyuan.online/RamseyGraph)
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</div>
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本仓库托管了一些与经典 **拉姆齐数(Ramsey Number)** 相关的图。你可以使用以下代码获取:
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```bash
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'r55_42some']
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```
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# 介绍
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-
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| 一个 6 结点的 Ramsey(4, 4) 图及其补图 |
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-
| --------------- |
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| 它不包含 4 个顶点的完全子图,也不包含 4 个顶点的完全独立集。 |
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**Ramsey(s,t,n) 图** 是具有 $n$ 个顶点的图,它不包含大小为 $s$ 的团,也不包含大小为 $t$ 的独立集。通常将 `n` 省略,用 **Ramsey(s,t) 图** 代指某些 $n$ 的 Ramsey(s,t,n) 图。**拉姆齐定理**表示,对于给定的 $s$ 和 $t$,Ramsey(s,t) 图的数量是有限的。我们称满足 Ramsey 图的最小顶点数为**拉姆齐数(Ramsey Number)**。然而,找到所有这样的图,甚至确定它们存在的最大 $n$,都是一个著名的组合数学难题。
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人类已知的拉姆齐数非常有限,大部分只能知道该数的上界和下界。一个方法是寻找最大的拉姆齐图,它的顶点数就是拉姆齐数的下界。
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如果你对这个主题感兴趣,可以尝试找一下 **最大的 Ramsey(5,5) 图**。人们已经将 42 顶点的 Ramsey(5,5) 图全部找到了,但是不确定有没有 43 顶点的 Ramsey(5,5) 图。拉姆齐数 Ramsey(5,5) 的下界最后一次被改进是在 1989 年。只要你找到一个,那就是这个领域 35 年来的重要进展!
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> 有关拉姆齐图的最新研究,请参见 **Radziszowski** 的动态综述,持续更新刊登于 [**电子组合学期刊**](https://www.combinatorics.org)。
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## 拉姆齐数
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**拉姆齐数** 是指满���拉姆齐图的最小顶点数。以下是一些已知的拉姆齐数:
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| s\t | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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| --- | --- | --- | --- | --- | ------- | --------- | --------- | ---------- | ---------- | ----------- |
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| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
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| 2 | - | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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| 3 | - | - | 6 | 9 | 14 | 18 | 23 | 28 | 36 | 40 - 41 |
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| 4 | - | - | - | 18 | 25 | 36 - 40 | 49 - 58 | 59 - 79 | 73 - 106 | 92 - 136 |
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| 5 | - | - | - | - | 43 - 48 | 59 - 85 | 80 - 133 | 101 - 194 | 133 - 282 | 149 - 381 |
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| 6 | - | - | - | - | - | 102 - 161 | 115 - 273 | 134 - 427 | 183 - 656 | 204 - 949 |
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-
| 7 | - | - | - | - | - | - | 205 - 497 | 219 - 840 | 252 - 1379 | 292 - 2134 |
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-
| 8 | - | - | - | - | - | - | - | 282 - 1532 | 329 - 2683 | 343 - 4432 |
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-
| 9 | - | - | - | - | - | - | - | - | 565 - 5366 | 581 - 9797 |
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| 10 | - | - | - | - | - | - | - | - | - | 798 - 17730 |
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## 进展
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-
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| 顶点数 | Ramsey(3,4) | Ramsey(3,5) | Ramsey(3,6) | Ramsey(4,4) 图 |
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| ------ | ------------------------ | -------------------------- | ------------------------------------------- | -------------------------------------------- |
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size_categories:
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- 100M<n<1B
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---
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<div align="center">
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<h1>拉姆齐图</h1>
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+
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[](https://opensource.org/licenses/MIT)
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[](https://huggingface.co/datasets/linxy/RamseyGraph)
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[](https://linxueyuan.online/RamseyGraph)
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</div>
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+
| 一个 6 结点的 Ramsey(4, 4) 图及其补图 |
|
| 25 |
+
| --------------- |
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| 26 |
+
|  |
|
| 27 |
+
| 它不包含 4 个顶点的完全子图,也不包含 4 个顶点的完全独立集。 |
|
| 28 |
+
|
| 29 |
+
**Ramsey(s,t,n) 图** 是具有 $n$ 个顶点的图,它不包含大小为 $s$ 的团,也不包含大小为 $t$ 的独立集。通常将 `n` 省略,用 **Ramsey(s,t) 图** 代指某些 $n$ 的 Ramsey(s,t,n) 图。**拉姆齐定理**表示,对于给定的 $s$ 和 $t$,Ramsey(s,t) 图的数量是有限的。我们称满足 Ramsey 图的最小顶点数为**拉姆齐数(Ramsey Number)**。然而,找到所有这样的图,甚至确定它们存在的最大 $n$,都是一个著名的组合数学难题。
|
| 30 |
+
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+
人类已知的拉姆齐数非常有限,大部分只能知道该数的上界和下界。一个方法是寻找最大的拉姆齐图,它的顶点数就是拉姆齐数的下界。
|
| 32 |
+
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| 33 |
+
如果你对这个主题感兴趣,可以尝试找一下 **最大的 Ramsey(5,5) 图**。人们已经将 42 顶点的 Ramsey(5,5) 图全部找到了,但是不确定有没有 43 顶点的 Ramsey(5,5) 图。拉姆齐数 Ramsey(5,5) 的下界最后一次被改进是在 1989 年。只要你找到一个,那就是这个领域 35 年来的重要进展!
|
| 34 |
+
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| 35 |
+
> 有关拉姆齐图的最新研究,请参见 **Radziszowski** 的动态综述,持续更新刊登于 [**电子组合学期刊**](https://www.combinatorics.org)。
|
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+
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+
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+
## 拉姆齐数
|
| 39 |
+
|
| 40 |
+
**拉姆齐数** 是指满足拉姆齐图的最小顶点数。以下是一些已知的拉姆齐数:
|
| 41 |
+
|
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+
| s\t | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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+
| --- | --- | --- | --- | --- | ------- | --------- | --------- | ---------- | ---------- | ----------- |
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+
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
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| 2 | - | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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| 3 | - | - | 6 | 9 | 14 | 18 | 23 | 28 | 36 | 40 - 41 |
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| 4 | - | - | - | 18 | 25 | 36 - 40 | 49 - 58 | 59 - 79 | 73 - 106 | 92 - 136 |
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+
| 5 | - | - | - | - | 43 - 48 | 59 - 85 | 80 - 133 | 101 - 194 | 133 - 282 | 149 - 381 |
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| 49 |
+
| 6 | - | - | - | - | - | 102 - 161 | 115 - 273 | 134 - 427 | 183 - 656 | 204 - 949 |
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| 50 |
+
| 7 | - | - | - | - | - | - | 205 - 497 | 219 - 840 | 252 - 1379 | 292 - 2134 |
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| 51 |
+
| 8 | - | - | - | - | - | - | - | 282 - 1532 | 329 - 2683 | 343 - 4432 |
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| 52 |
+
| 9 | - | - | - | - | - | - | - | - | 565 - 5366 | 581 - 9797 |
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+
| 10 | - | - | - | - | - | - | - | - | - | 798 - 17730 |
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+
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+
## 如何使用
|
| 56 |
+
|
| 57 |
本仓库托管了一些与经典 **拉姆齐数(Ramsey Number)** 相关的图。你可以使用以下代码获取:
|
| 58 |
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| 59 |
```bash
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'r55_42some']
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```
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## 进展
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| 91 |
+
目前人们已经找到了许多拉姆齐图,但仍有许多图尚未找到。以下是一些已知的拉姆齐图(也可在本仓库 `data/` 目录中找到):
|
| 92 |
|
| 93 |
| 顶点数 | Ramsey(3,4) | Ramsey(3,5) | Ramsey(3,6) | Ramsey(4,4) 图 |
|
| 94 |
| ------ | ------------------------ | -------------------------- | ------------------------------------------- | -------------------------------------------- |
|