delete recursion from root

there's theory/recursion for that

sheets/recursion

@@ -1,11 +0,0 @@
-# Recursion 
-# Def: "...is a method where the solution to a problem depends on solutions to smaller instance of the same problem.." - wiki
-# TL;DR: a function that calls itself inside its body. 
-
-# Recursive programs - Pseduocode 
-function factorial: 
-input: integer n such that n >= 0
-output: n * (n-1) * (n-2) * ... * 1 = n!
-
-    1. if n is 0,   return 1 
-    2. else,        return ( n * factorial(n-1) )