Encyclopedias
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CRC Concise Encyclopedia of MathematicsBy Eric W. Weisstein. 2nd edition.
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Encyclopedia of MathematicsA wiki-style, open access resource for the mathematics community. The original articles are from the online Encyclopaedia of Mathematics (by E Hazewinkel), but are now open to crowdsourced edits. Also includes the Statprob category for statistics and probability content.
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The Online Encyclopedia of Integer SequencesContains information on integer sequences, including the leading terms of the sequence, keywords, mathematical motivations, literature links, and more. The database is searchable by keyword, by subsequence, or by any of 16 fields.
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The VNR Concise Encyclopedia of MathematicsA good resource for general, non-specialist readers.
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Wolfram MathWorldAssembled by Eric W. Weisstein, Wolfram Math World is the web version of the CRC Concise Encyclopedia of Mathematics.
Dictionaries
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The Concise Oxford Dictionary of MathematicsGood for undergraduate students. Excludes statistics, computing and applied mathematics.
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An Encyclopedic Dictionary of MathematicsA translation of Iwanami Sūgaku Jiten by the Mathematical Society of Japan. Includes detailed entries and biographical information.
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The Cambridge Dictionary of StatisticsOver 3600 terms are defined, covering medical, survey, theoretical, and applied statistics, including computational aspects. Entries are provided for standard and specialized statistical software.
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International Dictionary of Applied MathematicsA good resource for math applications in the sciences and engineering.
Handbooks
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NIST Handbook of Mathematical FunctionsProduced by the National Institute of Standards and Technology.
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NIST Digital Library of Mathematical FunctionsA companion to the NIST Handbook of Mathematical Functions.
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Handbook of Discrete And Combinatorial MathematicsComprehensive resource on discrete mathematics.
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The Concise Handbook of AlgebraDivided into chapters on semigroups, groups, rings and modules, fields, representation theory, lattices, universal algebra, homological algebra, etc..
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Oxford Handbook of Philosophy of Math and LogicCovers the current state of the art in the philosophy of math and logic in a comprehensive and accessible manner, giving the reader an overview of the major problems positions, and battle lines.
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Handbook of Integral EquationsContains over 2,500 integral equations with solutions as well as analytical and numerical methods for solving linear and nonlinear equations.
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Handbook of Differential EquationsIncludes techniques for solving and approximating both ordinary and partial differential equations.
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Handbook of Mathematics for Engineers and ScientistsFocuses on the methods used for obtaining solutions of various classes of mathematical equations that underlie the mathematical modeling of numerous phenomena and processes in science and technology.
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Handbook of Statistical DistributionsIncludes most frequently used distribution by statisticians.