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Re: Multiplication by 0: nonzero in versions 8 and 9
Posted:
Jun 16, 2013 5:09 AM


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



