Michel Marie Deza, Elena Deza.
link.springer.com
#encyclopedia
6 tools curated in this category — including Encyclopedia of Distances (4th Edition), The Princeton Companion to Mathematics, The On-Line Encyclopedia of Integer Sequences
Find on mySelectas all sites and tools related to encyclopedia. This selection of 6 resources is reviewed and maintained by the community. The most popular include Encyclopedia of Distances (4th Edition), The Princeton Companion to Mathematics, The On-Line Encyclopedia of Integer Sequences. Each tool comes with a review, tags, comparisons and alternatives to help you make the best choice.
Timothy Gowers (Professor, Fields medallist), June Barrow-Green (Professor), and Imre Leader (Professor).
press.princeton.edu
Great compendium of many different integer sequences. Founded 1964 by N. J. A. Sloane.
oeis.org
Wolfram Mathworld
mathworld.wolfram.com
ProofWiki
proofwiki.org
Planetmath
planetmath.org