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https://math.stackexchange.com/a/4493218/35416 | |
For each of the 52 incidences (columns), this table | |
shows the line coordinates, point coordinates, and | |
352 different suite assignments. The first 8 of | |
these have a 13-fold symmetry, the others don't. | |
0000000000000000111111111111111111112222222222222222 | |
0000111111112222000000001111111122220000111111112222 | |
1111000011111111000011110000111111111111000011111111 |
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https://math.stackexchange.com/q/4141558/35416 | |
0 = (-d + R)*a^2 | |
+ (-2*L)*a | |
+ (-d + R) | |
or | |
0 = (-c + L)*a^2 | |
+ (-c - L) |
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https://math.stackexchange.com/a/4134048/35416 | |
0 = (4*h^2 - 8*h*R + 4*R^2)*N^4 | |
+ (-4*b^2*h - 4*e^2*h + 4*f^2*h - 12*h^3 + 4*b^2*R + 4*e^2*R - 4*f^2*R + 36*h^2*R - 40*h*R^2 + 16*R^3)*N^3 | |
+ (b^4 + 2*b^2*e^2 + e^4 + 2*b^2*f^2 - 2*e^2*f^2 + f^4 + 16*b*e*f*h + 10*b^2*h^2 + 14*e^2*h^2 - 10*f^2*h^2 + 13*h^4 - 16*b*e*f*R - 20*b^2*h*R - 28*e^2*h*R + 20*f^2*h*R - 52*h^3*R + 8*b^2*R^2 + 16*e^2*R^2 - 12*f^2*R^2 + 88*h^2*R^2 - 72*h*R^3 + 24*R^4)*N^2 | |
+ (-8*b*e^3*f - 2*b^4*h - 6*e^4*h - 4*b^2*f^2*h - 2*f^4*h - 24*b*e*f*h^2 - 8*b^2*h^3 - 12*e^2*h^3 + 8*f^2*h^3 - 6*h^5 + 2*b^4*R + 6*e^4*R + 4*b^2*f^2*R + 2*f^4*R + 48*b*e*f*h*R + 24*b^2*h^2*R + 36*e^2*h^2*R - 24*f^2*h^2*R + 30*h^4*R - 24*b*e*f*R^2 - 20*b^2*h*R^2 - 44*e^2*h*R^2 + 28*f^2*h*R^2 - 68*h^3*R^2 + 4*b^2*R^3 + 20*e^2*R^3 - 12*f^2*R^3 + 84*h^2*R^3 - 56*h*R^4 + 16*R^5)*N | |
+ (b^4*e^2 - 2*b^2*e^4 + e^6 + 2*b^2*e^2*f^2 + 2*e^4*f^2 + e^2*f^4 + 8*b*e^3*f*h + b^4*h^2 + 3*e^4*h^2 + 2*b^2*f^2*h^2 + f^4*h^2 + 8*b*e*f*h^3 + 2*b^2*h^4 + 3*e^2*h^4 - 2*f^2*h^4 + h^6 - 8*b*e^3 |
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<p>Original problem:</p> | |
<ol> | |
<li><p>First item.</p></li> | |
<li><pre><code>Some code. | |
More code. | |
</code></pre> | |
<p>There is code here.</p></li> | |
</ol> |
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#!/usr/bin/python3 | |
# https://github.com/shainer/spinning-switches citing a problem from | |
# “So you think you've got problems?” by Alex Bellos. | |
# This is optimizing for minimum number of operations in the worst case. | |
def allrot(x): | |
return [((x << i) | (x >> (4 - i))) & 0b1111 for i in range(4)] | |
def normal(x): |
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dpkg-buildpackage -us -uc -ui -i -b | |
dpkg-buildpackage: info: source package sagemath | |
dpkg-buildpackage: info: source version 8.8-1~mvg1 | |
dpkg-buildpackage: info: source distribution unstable | |
dpkg-buildpackage: info: source changed by Martin von Gagern <Martin.vGagern@gmx.net> | |
dpkg-source -i --before-build . | |
dpkg-buildpackage: info: host architecture amd64 | |
dpkg-source: info: using options from sagemath/debian/source/options: --tar-ignore=debian/ccache --extend-diff-ignore=^(sage/m4/sage_spkg_configures.m4) | |
debian/rules clean | |
dh clean --with=python2,sphinxdoc |
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// Numeric experiment for https://math.stackexchange.com/q/2434673/35416 | |
#include <cmath> | |
#include <random> | |
#include <iostream> | |
#include <iomanip> | |
// Barycentric coordinates | |
struct vec { | |
double c[3]; |
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/* | |
* Copyright 2013 Martin von Gagern | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software |
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# USE=python_targets_python3_5 emerge --nodeps -1 blender | |
!!! Problem resolving dependencies for media-gfx/blender | |
!!! The ebuild selected to satisfy "blender" has unmet requirements. | |
- media-gfx/blender-2.78a-r1::gentoo USE="boost bullet dds doc elbeem ffmpeg fftw game-engine jack jpeg2k nls openexr openmp sdl sndfile tiff -collada -colorio -cuda -cycles -debug -headless -jemalloc -libav -llvm -man -ndof -openal -opencl -openimageio -opensubdiv -openvdb -player -test -valgrind" ABI_X86="64" PYTHON_TARGETS="-python3_5" | |
The following REQUIRED_USE flag constraints are unsatisfied: | |
python_targets_python3_5 |
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