Re: model of Z
¬a\/b wrote:
> Z=set of signed integers
> what about to allow existence of +0 and -0?
In mathematics, zero is neither signed nor unsigned.
In the two's complement system, there is only one zero. And it is still
considered neither signed nor unsigned.
In the one's complement system, there are two versions of zero, +0 and
-0, but they are considered equivalent. IEEE floating point format, for
example, uses a one's complement notation for signed numbers.
Cheers,
Randy Hyde
.
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