Skip to main content
Toggle navigation
Secondary menu
about Plus
Plus sponsors
subscribe to Plus
terms of use
Search form
Search
Home
Articles
News
Packages
Podcasts
Puzzles
Reviews
Videos
Login
cut-and-shift proof
On the dissecting table
Bill Casselman
writes about the intriguing amateur mathematician Henry Perigal, who took his elegant proof of Pythagoras' Theorem literally to his grave - by having it carved on his tombstone.
Read more...