Math 404 - a collection of math-aware “404 Not Found” pages

The entries of the following list are in alphabetical order of the domain names. Please see the archive file if you would like to feel nostalgic by remembering lost ones.

The Aperiodical

https://aperiodical.com/math-404

Department of Mathematics, The University of Arizona

http://math.arizona.edu/academics/math-404

• https://web.archive.org/web/20200825175755/https://www.math.arizona.edu/themes/uamath/img/404.png

Magnt

https://www.magnt.com/math-404

• https://web.archive.org/web/20160115005749/http://magnt.com/404notfound/

Mathigon

https://mathigon.org/math-404

MathWorks

https://www.mathworks.com/math-404

• https://web.archive.org/web/20170105060053/https://www.mathworks.com/404.html

Stan

https://mc-stan.org/math-404

• https://web.archive.org/web/20171113121135/http://mc-stan.org:80/404.html

School of Mathematical Sciences, The University of Nottingham

https://www.maths.nottingham.ac.uk/math-404

• https://web.archive.org/web/20131216155846/https://www.maths.nottingham.ac.uk/errors/findx.gif

Mathematics Stack Exchange

https://math.stackexchange.com/math-404

• https://web.archive.org/web/20230824035932/http://cdn.sstatic.net/Sites/math/img/404.png

Mathematica & Wolfram Language Stack Exchange

https://mathematica.stackexchange.com/math-404

• https://web.archive.org/web/20231205221416/http://cdn.sstatic.net/Sites/mathematica/img/404.png

Cross Validated

https://stats.stackexchange.com/math-404

• https://web.archive.org/web/20160613103912/https://cdn.sstatic.net/Sites/stats/img/404.png