Steve Bailey said:The statement "All odd numbers are not prime" could be interpreted as meaning that none of the odd numbers are prime. Saying "Not all odd numbers are prime" is less ambiguous. Mathemeticians strive to eliminate ambiguity.
OK, I can see that. But, if I meant that no odd numbers were prime, I would have said that. So what we have here, is that mathemticians, while striving to eliminate ambiguity, have actually created more of it by corrupting common usage. For my part, i thrive on ambuguity. Even if i don't know how to spell it.
-jeff