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Topic: Multiplication by 0: non-zero in versions 8 and 9
Replies: 2   Last Post: Jun 16, 2013 5:14 AM

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Murray Eisenberg

Posts: 2,105
Registered: 12/6/04
Re: Multiplication by 0: non-zero in versions 8 and 9
Posted: Jun 16, 2013 5:14 AM
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In fact, the Mathematica behavior you observe in later versions, while
possibly disconcerting on strictly mathematical grounds, is reassuring
on software consistency grounds. Thus, the 9.0.1 documentation page
tutorial/ExactAndApproximateResults says:

"Whenever you give a number with an explicit decimal point,
Mathematica produces an approximate
numerical result [for a calculation involving that number]."

Personally, I would be unhappy if I did a calculation some of whose
numbers were approximate yet whose answer gave a misleading exact
On Jun 15, 2013, at 4:23 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 .
> Sotirios Bonanos

Murray Eisenberg
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2838 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305

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