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| #!/usr/bin/env python3 | |
| """Exact finite checks for marginal kernels and separable coding obstructions. | |
| Only standard-library integers and fractions. These checks do not prove | |
| all-dimension statements or literature priority; proofs are in the manuscript. | |
| """ | |
| from fractions import Fraction as F | |
| from itertools import product, combinations | |
| from math import prod | |
| import json | |
| import random | |
| def points(shape): | |
| return list(product(*(range(q) for q in shape))) | |
| def dot(a, b): | |
| return sum((x * y for x, y in zip(a, b)), F(0)) | |
| def rank(rows): | |
| if not rows: | |
| return 0 | |
| a = [list(map(F, row)) for row in rows] | |
| nr, nc = len(a), len(a[0]) | |
| pivot = 0 | |
| for j in range(nc): | |
| found = next((i for i in range(pivot, nr) if a[i][j]), None) | |
| if found is None: | |
| continue | |
| a[pivot], a[found] = a[found], a[pivot] | |
| value = a[pivot][j] | |
| a[pivot] = [x / value for x in a[pivot]] | |
| for i in range(pivot + 1, nr): | |
| if a[i][j]: | |
| factor = a[i][j] | |
| a[i] = [x - factor * y for x, y in zip(a[i], a[pivot])] | |
| pivot += 1 | |
| if pivot == nr: | |
| break | |
| return pivot | |
| def marginal_matrix(shape): | |
| xs = points(shape) | |
| rows = [] | |
| descriptors = [] | |
| for i in range(len(shape)): | |
| other = [j for j in range(len(shape)) if j != i] | |
| for assignment in product(*(range(shape[j]) for j in other)): | |
| row = [int(all(x[j] == a for j, a in zip(other, assignment))) for x in xs] | |
| rows.append(row) | |
| descriptors.append((i, other, assignment)) | |
| return rows, descriptors | |
| def matvec(a, x): | |
| return [dot(row, x) for row in a] | |
| def transpose_matvec(a, x): | |
| return [sum((a[i][j] * x[i] for i in range(len(a))), F(0)) | |
| for j in range(len(a[0]))] | |
| def one_factor_basis(q): | |
| # Orthogonal integer Helmert contrasts; no square roots are approximated. | |
| out = [[F(1)] * q] | |
| for a in range(1, q): | |
| out.append([F(1 if x < a else -a if x == a else 0) for x in range(q)]) | |
| for i, u in enumerate(out): | |
| for v in out[:i]: | |
| assert dot(u, v) == 0 | |
| return out | |
| def tensor_vector(shape, basis, labels): | |
| return [F(prod(basis[i][labels[i]][x[i]] for i in range(len(shape)))) | |
| for x in points(shape)] | |
| def center_coordinate(shape, values, coordinate): | |
| xs = points(shape) | |
| lookup = dict(zip(xs, values)) | |
| out = [] | |
| for x in xs: | |
| total = F(0) | |
| for a in range(shape[coordinate]): | |
| y = list(x) | |
| y[coordinate] = a | |
| total += lookup[tuple(y)] | |
| out.append(total / shape[coordinate]) | |
| return out | |
| def observable_from_marginals(shape, sums): | |
| """Reconstruct (I-P_K)z using inclusion-exclusion of averaging maps. | |
| The input consists only of actual codimension-one sums; no original z | |
| or hidden tensor coefficients are available to this decoder. | |
| """ | |
| a, descriptions = marginal_matrix(shape) | |
| xs = points(shape) | |
| one_coordinate_averages = [] | |
| for i in range(len(shape)): | |
| entries = {} | |
| for value, (coord, other, assignment) in zip(sums, descriptions): | |
| if coord == i: | |
| entries[assignment] = value / shape[i] | |
| other = [j for j in range(len(shape)) if j != i] | |
| one_coordinate_averages.append([entries[tuple(x[j] for j in other)] for x in xs]) | |
| out = [F(0)] * len(xs) | |
| for size in range(1, len(shape) + 1): | |
| for subset in combinations(range(len(shape)), size): | |
| value = one_coordinate_averages[subset[0]] | |
| for i in subset[1:]: | |
| value = center_coordinate(shape, value, i) | |
| sign = 1 if size % 2 else -1 | |
| out = [x + sign * y for x, y in zip(out, value)] | |
| assert matvec(a, out) == sums | |
| return out | |
| def check_spectrum(): | |
| reports = [] | |
| count = 0 | |
| for shape in ((2, 2), (3, 3), (4, 4), (2, 3, 4), (3, 3, 3)): | |
| a, _ = marginal_matrix(shape) | |
| basis = [one_factor_basis(q) for q in shape] | |
| null_count = 0 | |
| spectral_multiplicity = {} | |
| for labels in product(*(range(q) for q in shape)): | |
| v = tensor_vector(shape, basis, labels) | |
| expected_eigenvalue = sum(q for q, label in zip(shape, labels) if label == 0) | |
| lhs = transpose_matvec(a, matvec(a, v)) | |
| assert lhs == [expected_eigenvalue * x for x in v] | |
| spectral_multiplicity[expected_eigenvalue] = spectral_multiplicity.get( | |
| expected_eigenvalue, 0) + 1 | |
| null_count += expected_eigenvalue == 0 | |
| count += 1 | |
| expected_nullity = prod(q - 1 for q in shape) | |
| actual_rank = rank(a) | |
| assert null_count == expected_nullity | |
| assert actual_rank == prod(shape) - expected_nullity | |
| assert min(e for e in spectral_multiplicity if e) == min(shape) | |
| reports.append({"shape": list(shape), "N": prod(shape), | |
| "rank": actual_rank, "kernel_dimension": expected_nullity, | |
| "gram_eigenvalues_and_multiplicities": spectral_multiplicity}) | |
| return {"exact_eigenvector_cases": count, "shapes": reports} | |
| def check_separable_channels(): | |
| reports = [] | |
| for shape in ((2, 2), (3, 3), (4, 4), (2, 3, 4), (3, 4, 4), (3, 3, 3)): | |
| a, _ = marginal_matrix(shape) | |
| xs = points(shape) | |
| for m in range(1, min(shape) + 1): | |
| stacked = [] | |
| coordinate_ranks = [] | |
| for q in shape: | |
| coordinate_ranks.append(rank([[(x + 1) ** j for x in range(q)] | |
| for j in range(m)])) | |
| for j in range(m): | |
| # All coordinate factors are strictly positive Vandermonde rows. | |
| mask = [prod((x[i] + 1) ** j for i in range(len(shape))) for x in xs] | |
| assert min(mask) > 0 | |
| stacked.extend([[F(value) * weight for value, weight in zip(row, mask)] | |
| for row in a]) | |
| expected_nullity = prod(q - r for q, r in zip(shape, coordinate_ranks)) | |
| actual_nullity = prod(shape) - rank(stacked) | |
| assert actual_nullity == expected_nullity | |
| assert expected_nullity == prod(max(q - m, 0) for q in shape) | |
| reports.append({"shape": list(shape), "channels": m, | |
| "coordinate_ranks": coordinate_ranks, | |
| "joint_nullity": actual_nullity}) | |
| # Repeating a proportional channel adds no information. | |
| repeated = a + [[3 * x for x in row] for row in a] | |
| assert rank(repeated) == rank(a) | |
| # Highlighted strict obstructions and their exact endpoints. | |
| summary = {(tuple(r['shape']), r['channels']): r['joint_nullity'] for r in reports} | |
| assert summary[((3, 3), 2)] == 1 and summary[((3, 3), 3)] == 0 | |
| assert summary[((4, 4), 3)] == 1 and summary[((4, 4), 4)] == 0 | |
| assert summary[((2, 3, 4), 2)] == 0 | |
| return {"stacked_rank_cases": len(reports), | |
| "proportional_channel_counterexamples": 6, "cases": reports} | |
| def check_scalar_completion(): | |
| rng = random.Random(20102026) | |
| completed = probe_count = orthogonality_checks = null_probe_tests = 0 | |
| examples = [] | |
| for shape in ((2, 2), (3, 3), (4, 4), (2, 3, 4), (3, 3, 3)): | |
| a, _ = marginal_matrix(shape) | |
| basis = [one_factor_basis(q) for q in shape] | |
| hidden = [tensor_vector(shape, basis, labels) | |
| for labels in product(*(range(1, q) for q in shape))] | |
| expected_d = prod(q - 1 for q in shape) | |
| assert len(hidden) == expected_d | |
| for i, u in enumerate(hidden): | |
| assert matvec(a, u) == [0] * len(a) | |
| for v in hidden[:i]: | |
| assert dot(u, v) == 0 | |
| orthogonality_checks += 1 | |
| for repetition in range(4): | |
| z = [F(rng.randrange(1, 100), rng.randrange(1, 20)) | |
| for _ in range(prod(shape))] | |
| sums = matvec(a, z) | |
| visible = observable_from_marginals(shape, sums) | |
| for h in hidden: | |
| assert dot(h, visible) == 0 | |
| total = sum(sums[:prod(shape) // shape[0]], F(0)) | |
| assert total == sum(z, F(0)) | |
| out = list(visible) | |
| for h in hidden: | |
| alpha = F(1, 1 + max(map(abs, h))) | |
| mask = [1 + alpha * x for x in h] | |
| assert min(mask) > 0 and max(mask) < 2 | |
| assert sum(mask, F(0)) == prod(shape) | |
| measured = dot(mask, z) | |
| coefficient = (measured - total) / (alpha * dot(h, h)) | |
| out = [x + coefficient * y for x, y in zip(out, h)] | |
| probe_count += 1 | |
| assert out == z | |
| completed += 1 | |
| # Omitting one orthogonal completion leaves a concrete positive | |
| # indistinguishable pair, illustrating the general rank lower bound. | |
| omitted = repetition % len(hidden) | |
| delta = min(z) / (2 * max(map(abs, hidden[omitted]))) | |
| alternative = [x + delta * y for x, y in zip(z, hidden[omitted])] | |
| assert min(alternative) > 0 and alternative != z | |
| assert matvec(a, alternative) == sums | |
| for i, h in enumerate(hidden): | |
| if i != omitted: | |
| assert dot(h, alternative) == dot(h, z) | |
| null_probe_tests += 1 | |
| examples.append({"shape": list(shape), "necessary_and_sufficient_extra_scalars": expected_d}) | |
| return {"positive_tensor_reconstructions": completed, | |
| "positive_mask_scalar_probes": probe_count, | |
| "orthogonality_checks": orthogonality_checks, | |
| "missing_probe_nonuniqueness_examples": null_probe_tests, | |
| "dimensions": examples} | |
| def check_bounded_fourier_completion(): | |
| """Exact fourth-root-of-unity cases of the general Fourier construction. | |
| Shapes use only 2 and 4, so real/imaginary character values are integers; | |
| no trigonometric approximation or complex floating point is involved. | |
| """ | |
| reports = [] | |
| noise_equalities = 0 | |
| rho = F(1, 2) | |
| roots = ((1, 0), (0, 1), (-1, 0), (0, -1)) | |
| for shape in ((2, 2), (4, 4), (2, 4, 4), (4, 4, 4)): | |
| xs = points(shape) | |
| a, _ = marginal_matrix(shape) | |
| contrasts = [] | |
| for frequency in product(*(range(1, q) for q in shape)): | |
| conjugate = tuple((-k) % q for k, q in zip(frequency, shape)) | |
| if frequency > conjugate: | |
| continue | |
| real, imag = [], [] | |
| for x in xs: | |
| phase = sum((4 // q) * k * xi for q, k, xi in zip(shape, frequency, x)) % 4 | |
| re, im = roots[phase] | |
| real.append(F(re)) | |
| imag.append(F(im)) | |
| contrasts.append(real) | |
| if frequency != conjugate: | |
| contrasts.append(imag) | |
| assert len(contrasts) == prod(q - 1 for q in shape) | |
| for i, h in enumerate(contrasts): | |
| assert matvec(a, h) == [0] * len(a) | |
| assert dot(h, h) in (prod(shape), F(prod(shape), 2)) | |
| for other in contrasts[:i]: | |
| assert dot(h, other) == 0 | |
| z = [F(2 + (i * 7) % 23, 5) for i in range(prod(shape))] | |
| visible = observable_from_marginals(shape, matvec(a, z)) | |
| total = sum(z, F(0)) | |
| reconstructed = list(visible) | |
| for h in contrasts: | |
| mask = [1 + rho * x for x in h] | |
| assert min(mask) >= F(1, 2) and max(mask) <= F(3, 2) | |
| coefficient = (dot(mask, z) - total) / (rho * dot(h, h)) | |
| reconstructed = [x + coefficient * y for x, y in zip(reconstructed, h)] | |
| assert reconstructed == z | |
| # Single-coordinate noise on a non-self-conjugate mode attains the | |
| # uniform sqrt(2/N)/rho bound. Binary-only shapes have the stronger one. | |
| target = min(contrasts, key=lambda h: dot(h, h)) | |
| epsilon = F(1, 1000) | |
| perturbation = [epsilon * x / (rho * dot(target, target)) for x in target] | |
| actual_error_squared = dot(perturbation, perturbation) | |
| exact_bound_squared = epsilon ** 2 / (rho ** 2 * dot(target, target)) | |
| assert actual_error_squared == exact_bound_squared | |
| if dot(target, target) == F(prod(shape), 2): | |
| assert actual_error_squared == 2 * epsilon ** 2 / (rho ** 2 * prod(shape)) | |
| noise_equalities += 1 | |
| reports.append({"shape": list(shape), "positive_probes": len(contrasts), | |
| "minimum_contrast_norm_squared": str(dot(target, target)), | |
| "recovered_exactly": True}) | |
| return {"exact_fourier_cases": len(reports), | |
| "sharp_noise_equalities": noise_equalities, "cases": reports} | |
| def run(): | |
| return {"status": "PASS", "arithmetic": "exact integers/Fractions", | |
| "spectrum": check_spectrum(), | |
| "separable_channels": check_separable_channels(), | |
| "scalar_completion": check_scalar_completion(), | |
| "bounded_fourier_completion": check_bounded_fourier_completion(), | |
| "scope": "Finite checks support proofs; no priority or physical-sensor optimality claim."} | |
| if __name__ == '__main__': | |
| print(json.dumps(run(), indent=2, sort_keys=True)) | |