# Recursive Functions

## Online Resources

Math?? $x=y$ and $$x=y$$

$$f(x)=\left\{ \begin{array}{c l}  x & x>0\\ -x & x<0  \end{array}\right$$

### ACSL Videos

The following videos show the solution to problems that have appeared in previous ACSL contests.

 Recursion Example 1 (CalculusNguyenify) The video walks through the solution to a straight-forward single-variable recursive function, that is, $f(x)=\left\{....\right$. The problem appeared in ACSL Senior Division Contest #1, 2014-2015. Recursion Example 2 (CalculusNguyenify) The video walks through the solution to a 2-variable recursive function, that is, $f(x,y)={....$. The problem appeared in ACSL Senior Division Contest #1, 2014-2015. Recursive Functions ACSL Example Problem (Tangerine Code) The video walks through the solution to a 2-variable recursive function, that is, $f(x,y)={....$.

### Other Videos

The follow YouTube videos cover various aspects of this topic; they were created by authors who are not involved (or aware) of ACSL, to the best of our knowledge. Some of the videos contain ads; ACSL is not responsible for the ads and does not receive compensation in any form for those ads.