Interactive Activities
Cut The Knot! MSET99 Talk Games & Puzzles Arithmetic/Algebra Geometry Probability Eye Opener Analog Gadgets Inventor's Paradox Did you know?... Proofs Math as Language Things Impossible My Logo Math Poll Other Math sit's Guest book News sit's Recommend this site
CTK Exchange
https://www.geocities.com/gregm112358/Hard_sudoku.pdf
I know how to do it by brute force, but the calculations are too nasty to complete, and I'd like to know a nice way.
https://www.mathlinks.ro/Forum/viewtopic.php?p=1024466#1024466
You may be curious to have a look at the old CTK Exchange archive.Please do not post there.
Copyright © 1996-2018 Alexander Bogomolny