Wolfram Research
Wolfram Math World: Recursive Function
A definition of recursive function, and the relation of recursive function to recursion. There is also an example defining f(x,y) as the function xy.
Wolfram Research
Wolfram Math World: Recursive Sequence
Defining recursive sequence, this site also discussed the relationship of Fibonacci numbers and recursive sequence.
Khan Academy
Khan Academy: Evaluate Sequences in Recursive Form
Find the first few terms of sequences that are defined recursively. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Overview of Quicksort
Learn how a quicksort uses divide-and-conquer, and so it's a recursive algorithm.
Khan Academy
Khan Academy: Spin Off of Project: Recursive Art
A practice project applying recursive algorithms.
Khan Academy
Khan Academy: Computing Powers of a Number
Although JavaScript has a built in pow function that computes powers of a number, learn how to write a similar function recursively.
Khan Academy
Khan Academy: Challenge: Iterative Factorial
Practice applying recursion with iterative factorials.
Khan Academy
Khan Academy: Using Recursion to Determine Whether a Word Is a Palindrome
Learn how to use recursion to determine whether a word is a palindrome.
Khan Academy
Khan Academy: Multiple Recursion With the Sierpinski Gasket
See a good example of a mathematical construct that is a fractal known as a Sierpinski gasket.
Khan Academy
Khan Academy: The Factorial Function
See examples of recursion, and look how to compute the factorial function.
Khan Academy
Khan Academy: Recursion
Learn about recursion and how it applies to different situations.
Wolfram Research
Wolfram Mathworld: Recursion
A brief description of recursive process from MathWorld. Click on any of the highlighted terms for more definitions.