Re: model of Z
¬a\/b wrote:
Z=set of signed integers
what about to allow existence of +0 and -0?
0 isn't in the set of signed integers; it has no sign. Adding a sign
doesn't help it get in the set either, as it's meaningless. The only
operation on 0 that I know of that generates a signed integer is 0!
(factorial 0) which has the value 1. So -(0!) and +(0!) have meaning.
--
Regards
Alex McDonald
.
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