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Re: Multiplication by 0: non-zero in versions 8 and 9
*To*: mathgroup at smc.vnet.net
*Subject*: [mg131182] Re: Multiplication by 0: non-zero in versions 8 and 9
*From*: Richard Fateman <fateman at cs.berkeley.edu>
*Date*: Sun, 16 Jun 2013 05:16:35 -0400 (EDT)
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On 6/15/2013 1:16 AM, Sotirios Bonanos wrote:
> Hello ,
>
> I have noticed that in all Mathematica versions <8, multiplying a
> real or complex number by the integer 0 gives 0, but in versions 8
> and 9
>
> Times[0, 0.567] gives 0.
>
> and
>
> Times[1.23 + I 2.45, 0] gives 0. + 0. I
>
> I don't know what prompted this change but it is definitely wrong:
> the zero property of multiplication holds for real and complex
> numbers also (see
> https://en.wikipedia.org/wiki/Multiplication#Properties) .
>
> Sotirios Bonanos http://www.inp.demokritos.gr/~sbonano/
>
>
You appear to be making a distinction between "0" and "0."
and "0.+0.I". Yet for Mathematica, 0==0.+0.*I returns True.
You may have a valid objection to something that has been
changed in the program, but appealing to the wikipedia
article is not particularly significant.
After all,
Times[0,x] comes out as 0, but this is not what happens
for x being 0., Indeterminate, Infinity, Interval[{-1,1}],
and probably other stuff.
As Dorothy said, you are not in Kansas anymore.
http://en.wiktionary.org/wiki/not_in_Kansas_anymore
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