Other
The Sigma Notation for Summation of Series
Conprehensive site explaining sigma notation. Site has many formulas and a few examples
Purple Math
Purplemath: Sequences and Series: Terminology and Notation
Explains the basic terminology and notation of sequences and series, including summation symbols, subscripts, and indices.
Wolfram Research
Wolfram Math World: Triangle Inequality
This MathWorld site gives a good explanation of triangle inequality. The reader should be familiar with summation notation.
Math2
Math2: Series Properties
This site contains the definition of summation, the notation for summation, and operations involving summation. Some of the operations explained include algebraically separating a summation into two separate summations and changing the...
University of California
University of California, Davis: The Calculus Page
This site, from the University of California, provides several problems from beginning differential calculus, as well as beginning integral calculus. The problems can be accessed by clicking on the link, and the information provided is...