CRC Standard Mathematical Tables and Formulae
Handbook of commonly used equations, tables, and formulae.
Encyclopaedia of Mathematical Sciences
Major mathematical specialties are covered by a sequence of volumes (e.g. Topology, Geometry, Algebraic Geometry, Several Complex Variables, Analysis, Lie Groups and Lie Algebras, Number Theory, Partial Differential Equations, and Dynamical Systems).
Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables
A compendium of mathematical formulas, tables, and graphs. It contains a very complete table of analytical integrals, differential equations, and numerical series; and includes tables of trigonometric and hyperbolic functions, tables for numerical integration, rules for differentiation and integration, and techniques for point interpolation and function approximation. Additionally, the book devotes an entire section to mathematical and physical constants as fractions and powers of Pi, e, and prime numbers; and discusses statistics by presenting combinatorial analysis and probability functions.
Handbook of Mathematics (6th Edition)
Contains in handbook form the fundamental working knowledge of mathematics which is needed as an everyday guide for students and scientists.
Mathematical Methods for Scientists and Engineers
Comprised of more than 2000 problems and 700 worked examples, this text is useful for self study.
Wolfram Functions Site
From the producers of the Mathematica software, this site is a compendium of information for mathematical functions.