## [笑話]The Odd Primes ### [笑話]The Odd Primes

The “Odd Primes” joke  of EPM
A mathematician, a physicist and an engineer enter a mathematics contest, the first task of which is to prove that all odd number are prime. The mathematician has an elegant argument: `1's a prime, 3's a prime, 5's a prime, 7's a prime. Therefore, by mathematical induction, all odd numbers are prime. It's the physicist's turn: `1's a prime, 3's a prime, 5's a prime, 7's a prime, 11's a prime, 13's a prime, so, to within experimental error, all odd numbers are prime.' The most straightforward proof is provided by the engineer: `1's a prime, 3's a prime, 5's a prime, 7's a prime, 9's a prime, 11's a prime ...'.

How a mathematician, physicist and an engineer prove that all odd numbers, (greater than 2), are prime.
Mathematician: "Well, 3 is prime, 5 is prime and 7 is prime so, by induction all odds are prime."
Physicist: "3 is prime, 5 is prime, 7 is prime, 9 isn't prime, (bad data point), 11 is prime, and so is 13, so all odds are prime."
Engineer: "3 is prime, 5 is prime, 7 is prime, 9 is prime, 11 is prime 13 is prime, so all odds are prime."

A mathematician, physicist and an engineer are asked whether all odd numbers, (greater than 2), are prime. Their responses:
Mathematician: "Let's see, 3 is prime, 5 is prime and 7 is prime, but 9 is a counter-example so the statement is false"
Physicist: "OK, 3 is prime, 5 is prime, 7 is prime, 9 isn't prime, 11 is prime, and so is 13, so all odds are prime to within experimental uncertainty."
Engineer: "3 is prime, 5 is prime, so all odds are prime."

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Other professions to the “Odd Primes” joke (1)
Several professors were asked to solve the following problem: "Prove that all odd integers are prime."
Mathematician: 3 is a prime, 5 is a prime, 7 is a prime, 9 is not a prime - counter-example - claim is false.
Physicist: 3 is a prime, 5 is a prime, 7 is a prime, 9 is an experimental error, 11 is a prime ...
Engineer: 3 is a prime, 5 is a prime, 7 is a prime, 9 is a prime, 11 is a prime ...
Computer Scientist: 3's a prime, 5's a prime, 7's a prime ... segmentation fault
Lawyers: one is prime, three is prime, five is prime, seven is prime, although there appears to be prima facie evidence that nine is not prime, there exists substantial precedent to indicate that nine should be considered prime. The following brief presents the case for nine's primeness...
Liberals: The fact that nine is not prime indicates a deprived cultural environment which can only be remedied by a federally funded cultural enrichment program.
Computer programmers: one is prime, three is prime, five is prime, five is prime, five is prime, five is prime five is prime, five is prime, five is prime...
Bush: What's nine got against being prime? I'll bet it won't allow the pledge of allegiance to be said in our schools either.
Richard Nixon: Put nine on the enemies list. I'm gonna get that number.
Rec.humor poster: one is prime, one is prime, one is prime, one is prime
Professor: 3 is prime, 5 is prime, 7 is prime, and the rest are left as an exercise for the student.
Computational linguist: 3 is an odd prime, 5 is an odd prime, 7 is an odd prime, 9 is a very odd prime,...
Computer Scientist: 10 prime, 11 prime, 101 prime...
Chemist: 1 prime, 3 prime, 5 prime... hey, let's publish!
Measure nontheorist: there are exactly as many odd numbers as primes (Euclid, Cantor), and exactly one even prime (namely 2), so there must be exactly one odd nonprime (namely 1).
New Yorker: 3 is prime, 5 is prime, 7 is prime, 9 is... NONE OF YOUR @@@ BUSINESS!
Programmer: 3 is prime, 5 is prime, 7 is prime, 9 will be fixed in the next release,...
C programmer: 03 is prime, 05 is prime, 07 is prime, 09 is really 011 which everyone knows is prime,...
BASIC programmer: What's a prime?
COBOL programmer: What's an odd number?

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Other professions to the “Odd Primes” joke (2)
Several professors were asked to solve the following problem: "Prove that all odd integers are prime."
Mathematician: 3 is a prime, 5 is a prime, 7 is a prime, 9 is not a prime - counter-example - claim is false.
Physicist: 3 is a prime, 5 is a prime, 7 is a prime, 9 is an experimental error, 11 is a prime ...
Engineer: 3 is a prime, 5 is a prime, 7 is a prime, 9 is a prime, 11 is a prime ...
Computer Scientist: 3's a prime, 5's a prime, 7's a prime ... segmentation fault
Lawyers: one is prime, three is prime, five is prime, seven is prime, although there appears to be prima facie evidence that nine is not prime, there exists substantial precedent to indicate that nine should be considered prime. The following brief presents the case for nine's primeness...
Liberals: The fact that nine is not prime indicates a deprived cultural environment which can only be remedied by a federally funded cultural enrichment program.
Computer programmers: one is prime, three is prime, five is prime, five is prime, five is prime, five is prime five is prime, five is prime, five is prime...
Bush: What's nine got against being prime? I'll bet it won't allow the pledge of allegiance to be said in our schools either.
Richard Nixon: Put nine on the enemies list. I'm gonna get that number.
Rec.humor poster: one is prime, one is prime, one is prime, one is prime
Professor: 3 is prime, 5 is prime, 7 is prime, and the rest are left as an exercise for the student.
Computational linguist: 3 is an odd prime, 5 is an odd prime, 7 is an odd prime, 9 is a very odd prime,...
Computer Scientist: 10 prime, 11 prime, 101 prime...
Chemist: 1 prime, 3 prime, 5 prime... hey, let's publish!
Measure nontheorist: there are exactly as many odd numbers as primes (Euclid, Cantor), and exactly one even prime (namely 2), so there must be exactly one odd nonprime (namely 1).
New Yorker: 3 is prime, 5 is prime, 7 is prime, 9 is... NONE OF YOUR ### BUSINESS!
Programmer: 3 is prime, 5 is prime, 7 is prime, 9 will be fixed in the next release,...
C programmer: 03 is prime, 05 is prime, 07 is prime, 09 is really 011 which everyone knows is prime,...
BASIC programmer: What's a prime?
COBOL programmer: What's an odd number?

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Other professions to the “Odd Primes” joke (3)
Mathematician: 3 is a prime, 5 is a prime, 7 is a prime, and by induction - every odd integer higher than 2 is a prime.
Physicist: 3 is a prime, 5 is a prime, 7 is a prime, 9 is an experimental error, 11 is a prime,...
Engineer: 3 is a prime, 5 is a prime, 7 is a prime, 9 is a prime, 11 is a prime,...
Programmer: 3's a prime, 5's a prime, 7's a prime, 7's a prime, 7's a prime,...
Salesperson: 3 is a prime, 5 is a prime, 7 is a prime, 9 -- we'll do for you the best we can,...
Computer Software Salesperson: 3 is prime, 5 is prime, 7 is prime, 9 will be prime in the next release,...
Biologist: 3 is a prime, 5 is a prime, 7 is a prime, 9 -- results have not arrived yet,...
Advertiser: 3 is a prime, 5 is a prime, 7 is a prime, 11 is a prime,...
Lawyer: 3 is a prime, 5 is a prime, 7 is a prime, 9 -- there is not enough evidence to prove that it is not a prime,...
Accountant: 3 is prime, 5 is prime, 7 is prime, 9 is prime, deducing 10% tax and 5% other obligations.
Statistician: Let's try several randomly chosen numbers: 17 is a prime, 23 is a prime, 11 is a prime...
Psychologist: 3 is a prime, 5 is a prime, 7 is a prime, 9 is a prime but tries to suppress it...

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