A mathematician, a physicist, an engineer, and a programmer were discussing the theorem that all odd numbers are prime.

Mathematician: 3 is prime, 5 is prime, 7 is prime, 9 is not prime. The theorem is false.

Physicist: 3 is prime, 5 is prime, 7 is prime, 9 is not, 11 is…. The theorem is true, within experimental error.

Engineer: 3 is prime, 5 is prime, 7 is prime, 9 is prime, 11 is prime…. The theorem is true.

Programmer: 3 is prime, 3 is prime, 3 is prime….