0. #lang racket
1.  
2. (define (inv_log m n)
3.         (cond
4.                 [(> m n)
5.                         0
6.                 ]
7.                 [else
8.                         ( + 1 (inv_log m*m n) )
9.                 ]
10.         )
11. )
12.  
13. (inv_log 2 9)

=>

m*m: undefined;

cannot reference an identifier before its definition

in module: 'm