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Subject: Re: OASIS: Infix Operator "^"

• To: gnumeric-list@gnome.org, office-comment@lists.oasis-open.org
• Date: Thu, 22 Feb 2007 23:34:02 +0200

```Andreas J Guelzow wrote:
> Unfortunately there is a
> significant discrepancy of the normal mathematical definitions and what
>

However, there is NO discrepancy what mathematicians use. Also,
dedicated mathematical programs are fairly consistent with these
precedence rules. I therefore recommend to every developer of a
mathematical standard to have first a look at Mathematica.
> [Of course there is an issue here: in OOo ^ appears to be
> left-associative while in Gnumeric it is right-associative.]
>
>> 1. “^” is left-associative, not right-associative!!!
>>
>
> Wherever I look I find that ^ is indeed right-associative contrary to

I meant right-associative! [The former was actually the definition
inside the OASIS document.]

So, 2^3^4 = 2^(3^4) as I indicated in my previous post, too. [the
formulas were correct]

>> 2. The classic ERROR: -4^2
>> Mathematically, this yields always -(4^2)=-16, NEVER +16!!!
>> There is NO unary operator in mathematics that converts a number to its
>> negative, like described in the documents.
>>
>
> This is utter nonsense. Of course there is such a unary operator. ...
NO, there is NO such unary operator: -x^2 = -x * -x = + x^2, THIS is
NONSENSE. Such a unary operator does NOT exist. We can invent a new
algebra with such an operator. It would simplify some things, we would
never have to use -x^2, because it would evaluate to +x^2 anyway. But it
would be utter nonsense.

Kind regards,