Here’s what you actually wanted to link to for “looking back”
https://web.archive.org/web/20070822013154/http://www.math.utah.edu/~pa/math/polya.html
Here’s what you actually wanted to link to for “looking back”
(edit: search ‘looking back’, i used to have it indexed with hyperlinks, but I lost that copy)https://web.archive.org/web/20070822013154/http://www.math.utah.edu/~pa/math/polya.html