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Comments in green were written by me. Comments in blue were not written by me.

Interesting tautologies

PhD thesis, chapter 5

PhD thesis, chapter 4

PhD thesis, chapter 3

Inverting a matrix

PhD thesis, chapter 2

Gaussian elimination

Matrix multiplication

Christmas (2019) is over

2018-01-02I particularly liked the riddle on the 5th of December (with walking 13 units) - it was quite tricky at first, but then I solved it by seeing that you can't end up on a square an even distance away from the centre, so the possible areas are in "circles" from the center with odd side lengths . It was quite reminiscent of showing you can't cover a chessboard with dominoes when two opposite corners are removed .

on /blog/48