proofwiki.org 的前十大競爭對手

math.stackexchange.com

Q&A for people studying math at any level and professionals in related fields

mathworld.wolfram.com

A connected graph G is distance-regular if for any vertices x and y of G and any integers i,j=0, 1, ...d (where d is the graph diameter), the number of vertices at distance i from x and distance j from y depends only on i, j, and the graph distance between x and y, independently of the choice of x and y. In particular, a distance-regular graph is a graph for which there exist integers b_i,c_i,i=0,...,d such that for any two vertices x,y in G and distance i=d(x,y), there are exactly c_i...

math.libretexts.org

The LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.

mathoverflow.net

Q&A for professional mathematicians

statproofbook.github.io

The Book of Statistical Proofs – a centralized, open and collaboratively edited archive of statistical theorems for the computational sciences

themathpage.com

need math homework help? read free math courses, problems explained simply and in few words. solve math problems online. learning math has never been such fun!

coolmath.com

cool math has free online cool math lessons, cool math games and fun math activities. really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers areas too.