Prime Number Theorem

Theorem: All odd numbers are prime.

Mathematician:

   1 is prime, 3 is prime, 5 is prime,
   7 is prime, 9... NO!
   Theorem is False!

Physicist:

   1 is prime, 3 is prime, 5 is prime, 
   7 is prime, 9... 
  11 is prime, 13 is prime. 
   All odd numbers are prime.
     (within tolerable experimental error)

Engineer:

   1 is prime, 3 is prime, 5 is prime, 
   7 is prime, 9 is prime, 11 is prime.
   All odd numbers are prime.

Computer Scientist:

   1 is prime, 3 is prime, 5 is prime, 
   7 is prime, 7 is prime, 7 is prime, 
   7 is prime, 7 is prime, 7 is prime, 
   7 is prime, 7 is prime, 7 is prime, 
   ...