# Melvil Decimal System: 512.81

## Dewmoji: đŦ > â > + > ? > ?

 0Information115,954âšī¸ 1Philosophy and Psychology115,844đ­ 2Religion 351,090đđŊ 3Social Sciences 554,451đĢ 4Language75,777đŦ 5Mathematics and Science181,736đŦ 6Technology414,821đĄ 7Arts and Recreation444,897đ¨ 8Literature605,140đ 9Biography and History396,598đŋ 50General Science17,000đŦ 51Mathematics32,369â 52Astronomy10,717đ 53Physics16,578đ 54Chemistry9,875â 55Earth sciences & geology15,630đ 56Fossils & prehistoric life4,102đ 57Life Sciences24,338đ 58Botany11,208đŋ 59Zoology39,919đŧ 510General Mathematics7,448â 511General Principles3,192đ 512Algebra4,625+ 513Arithmetic2,605đĸ 514Trigonometry; topology 755đŠ 515Analysis4,471ÎŖ 516Algebraic geometry2,551V 517Calculus704âĢ 518Numerical analysis225đģ 519Applied Mathematics, Probabilities5,793đ 512.0221 512.1Systems of algebra201 512.2Numeric equations; Imaginary expressions389 512.3Algebraic equations; Maxima and minima74 512.4Series; Fractions; Binomial theorem; Taylor's theorem185 512.5Combinatory analysis608 512.6Proportion and progression28 512.7Involution and evolution547 512.8Higher algebra443 512.9Problems and tables581 512.801 512.81Theory of numbers (see 511.1 Systems of arithmetic)140 512.82Theory of equations; Complex variable (See also 517.8)11 512.83Determinants1 512.84Symmetric functions 512.85Elimination; eliminants and discriminants2 512.86Tansformations; Substitutions60 512.87Quantics5 512.88Invariants; Covariants; Contravariants1 512.89130 512.810 512.8111 512.812 512.8132 512.8142 512.81518 512.816 512.81730 512.818 512.819

1922 Edition
Modern language
Emoji

## "Far Friends"

MDS classes with significant recommendations overlap, excluding ones under the same top-level class.

None

## Related tags

(11) @ofcl3 (10) algebra (23) analysis (15) arithmetic (11) congruences (5) foundations (6) Frege (11) German (6) Henriksen (10) location-dro (5) logic (77) math (405) mike's (5) non-fiction (54) number (5) number theory (92) philosophy (83) psychology (10) ring theory (5) science (14) set theory (38) Sets (7) textbook (11) to-read (9) topology (6)

## What is MDS?

Melvil stands for "Melvil Decimal System," named after Melvil Dewey, the famous librarian. Melvil Dewey invented his Dewey Decimal System in 1876, and early versions of his system are in the public domain.

More recent editions of his system are in copyright, and the name "Dewey," "Dewey Decimal," "Dewey Decimal Classification" and "DDC" are registered trademarked by OCLC, who publish periodic revisions.

LibraryThing's MDS system is based on the classification work of libraries around the world, whose assignments are not copyrightable. MDS "scheduldes" (the words that describe the numbers) are user-added, and based on public domain editions of the system.

The Melvil Decimal System is NOT the Dewey Decimal System of today. Wordings, which are entered by members, can only come from public domain sources. The base system is the Free Decimal System, a public domain classification created by John Mark Ockerbloom. Where useful or necessary, wording comes from the 1922 edition of the Dewey Decimal System. Language and concepts may be changed to fit modern tastes, or to better describe books cataloged. Wordings may not come from in-copyright sources.

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