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PlanetMath is a virtual community which aims to help make mathematical knowledge more accessible. PlanetMath's content is created collaboratively: the main feature is the mathematics encyclopedia with entries written and reviewed by members. The entries are contributed under the terms of the GNU Free Documentation License (FDL) in order to preserve the rights of both the authors and readers in a sensible way.

PlanetMath entries are written in LaTeX, the lingua franca of the worldwide mathematics community. All of the entries are automatically cross-referenced with each other, and the entire corpus is kept updated in real-time.

In addition to the mathematics encyclopedia, there are books, expositions, papers, and forums. You also might want to check out encyclopedia requests if you'd like to see something we don't have. We also have the encyclopedia available in offline-browsable snapshot form, and in book form. Also see PlanetMath-exclusive feature articles and topics.

Top starting points:  PlanetMath Overview - High School Mathematics - Calculus - Statistics - Real Numbers - (more)

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Latest Messages
Jan 6 06:38 - parent A Question on on ordered ablian groups by Nitworoc
Jan 5 21:46 - parent thread top Re: New Year Ponder This!!! by rm50
Jan 5 20:54 - parent someone knows how to get the transfer function of a nonlinear system????? by chchbrs
Jan 5 16:01 - parent thread top Re: computing sums by rspuzio
Jan 5 15:24 - parent thread top Re: narm afzar by majid1364
Jan 4 23:46 - parent New Year Ponder This!!! by PARASHAR
Jan 4 17:09 - parent computing sums by curious
Jan 4 14:28 - parent Claim D_yf(x,g(x)) invertible by kfgauss70
Jan 4 12:16 - parent thread top Re: HELP! by porton
Jan 4 11:43 - parent thread top Re: HELP! by rm50
Jan 4 09:45 - parent thread top Re: Zero-sets by ftr64
Jan 4 01:55 - parent thread top Re: HELP! by perucho
Jan 3 18:59 - parent HELP! by dh2718
Jan 3 17:13 - parent thread top Re: box function by mathcam
Jan 3 07:22 - parent thread top Re: answer by scineram
Jan 3 03:58 - parent box function by karajpardis
Jan 3 03:57 - parent thread top Re: spiral by sara_77
Jan 3 03:57 - parent thread top Re: limit by hasansalar
Jan 3 03:57 - parent thread top Re: answer by surush
Jan 3 03:55 - parent Book by yasinb
Jan 3 03:55 - parent thread top Re: answer by surush
Jan 3 03:54 - parent kasr by rostaali32
Jan 3 03:52 - parent answer by surush
Jan 3 03:52 - parent thread top Re: Fibo by hasansalar
Jan 3 03:51 - parent esbat by yunes131
Jan 3 03:51 - parent limit by arezoo
Jan 3 03:50 - parent thread top Re: javab fibonacci by hasansalar
Jan 3 03:49 - parent narm afzar by majid1364
Jan 3 03:48 - parent Geraph by babakbigi
Jan 3 03:48 - parent spiral by sara_77

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