johndcook.com > blog
Trinomial Coefficients and Kings
2+ day, 17+ hour ago —...Cook.... ...…] The post Trinomial Coefficients and Kings first appeared on John...
johndcook.com > blog
Riff on an integration bee integral
2+ day, 18+ hour ago —...an integral posted online that came from this year’s MIT Integration Bee... ...But on a quiz, like the Integration Bee, knowing that the result... ...We could calculate the log base 10 of the value using Python as follows...
johndcook.com > blog
Another little chess puzzle
4+ day, 2+ hour ago —...Here’s another little chess puzzle by Martin Gardner, taken from... ...Hereâs another little chess puzzle by Martin Gardner, taken from...
johndcook.com > blog
Multiplying by quaternions on the left and right
4+ day, 5+ hour ago —...Multiplying by quaternions on the left and right first appeared on John... ...Cook....
johndcook.com > blog
Embeddings, Projections, and Inverses
4+ day, 9+ hour ago —...first appeared on John D.... ...Cook. I just revised a post from a week ago about rotations....
johndcook.com > blog
Alternative exp and log notation
5+ day, 6+ hour ago —...the same properties using up and down arrow notation. [1] Margaret Brown... ...Cook....
johndcook.com > blog
Decimal Separator and Internationalization
5+ day, 12+ hour ago —...This morning I ran across the following tip from Joost Helberg on...
johndcook.com > blog
A crowded little chess puzzle
5+ day, 15+ hour ago —...Cook. Hereâs a puzzle by Martin Garnder [1].... ...Can a queen, king, rook, bishop, and knight be placed on a 4² board...
johndcook.com > blog
Formulating eight queens as a SAT problem
1+ week, 8+ hour ago —...Cook.... ...If thereâs a queen in the first column, then there is not a queen... ...or b has no queen.... ...that for every pair of squares in a row (a, b) either a has no queen...
johndcook.com > blog
Special solutions to the eight queens problem
1+ week, 9+ hour ago —...In the most orderly solution, every queen is on a straight line with... ...Cook.... ...In 1900 Henry Dudenay introduced the no-three-in-line problem, looking... ...In the least orderly solution, no queen is on a straight line with...