Mathematics is the science of space, number, quantity, and arrangement, whose methods involve logical reasoning and usually the use of symbolic notation, and which includes geometry, arithmetic, algebra, and analysis; mathematical operations or calculations. --Oxford English Dictionary
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QA1-43 General
QA47-59 Tables
QA71-90 Instruments and machines
QA75-76.95 Calculating machines
QA75.5-76.95 Electronic computers. Computer science
QA76.75-76.765 Computer software
QA101-(145) Elementary mathematics. Arithmetic
QA150-272.5 Algebra
QA273-280 Probabilities. Mathematical statistics
QA299.6-433 Analysis
QA440-699 Geometry. Trigonometry. Topology
QA801-939 Analytic mechanics