 Field Guide to Functions (Web Study Guide)  Oregon State University (OSU) Math Department
This field guide contains a quick look at the functions commonly encountered in single variable calculus, with exercises for each topic: linear, polynomial, power, rational, exponential, logarithmic, trigonometric, and piecewise functions. Also algebraic operations on functions, function composition, and general types of functions.
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 Function Institute (Zona Land)  Edward A. Zobel
Twodimensional (x,y) functions: linear (slopeintercept, pointslope, and general forms), polynomial (definition, roots, graphs), and exponential (definition, exponential growth, radioactive decay, money matters  simple, compound, and continuous interest, effective annual rate, ordinary annuity, and loans). From the Mathematics area of Zona Land: Education in Physics and Mathematics.
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 Mathematical Functions  Wolfram Research, Inc.
An encyclopedic collection of information about tens of thousands of mathematical functions. The site details the interrelationships between the special functions of mathematical physics and the elementary functions of mathematical analysis, as well as the interrelationships between the functions in each group. All of the formulas are available not only in Mathematica StandardForm but also in MathML and ASCII form. Search for functions and formulas by name.
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