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# Martin von Gagern gagern

Last active July 16, 2022 14:08
Assigning card suits to 𝔽₃ℙ²
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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
Created May 18, 2021 14:44
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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)
Created May 14, 2021 11:40
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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
Created June 23, 2020 23:28
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Created June 22, 2020 12:27
Hoedown code list issue
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Original problem:

1. First item.

2. Some code.
More code.

There is code here.

Last active June 2, 2020 10:16
Spinning switches
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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):
Created August 5, 2019 20:32
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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 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
Last active October 7, 2017 11:43
Numeric experiment on averge distance between points in Sierpinski triangle
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 // Numeric experiment for https://math.stackexchange.com/q/2434673/35416 #include #include #include #include // Barycentric coordinates struct vec { double c[3];
Created February 9, 2017 12:31
Run apache as non-root on privileged port
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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
Created January 25, 2017 20:29
Blender fails to emerge, can't seem to get USE flag in there
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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