[racket] clarification for beginners please

On 04/25/2013 02:57 PM, Matthias Felleisen wrote:
>> (eqv? (factorial 1000) (factorial 1000)) ;; ... but they point to observably equal numbers, so eqv? uses = to compare them
> #t
>> (eqv? (cons 1 2) (cons 1 2)) ;; distinct pointers point to allocated structures, on the other hand, and eqv? compares pointers with pointer equality
> #f
>
I understand the rationale for eq? and equal? - What is the rationale 
for eqv?

Thanks,
Dave