On 13/03/2012 15.26, RussellMc wrote:
>> For a certain value of '"proper" [tm] rules of mathematics' that is
>> certainly true. The trouble is in deciding that rules.
> Quite apart from precedence rules, one of the "rules" which is
> "universal" ([tm] again) is that multiplication is commutative.
No! This is not a rule but a property that desced from definition (on reals=
)!
A rule can be arbitrary but a property (in mathematics) no!

http://en.wikipedia.org/wiki/Multiplication#Properties

> ie A x B =3D B x A
> So far nobody seems to have addressed why this does not apply in the
> given example if the answer is to equal "1".
>
>
>         Russell
I lost the original post (subscribed to OT only two days ago) so i can miss=
 some=20
point.
I think that there is a problem of context (every context has his rules): s=
ome=20
context lacks of rules to forbid to write ambiguous formulas.
For example: at school I never see the use of "/" inline, the line of fract=
ion=20
must be used.
When I write software am used to use parenthesis to guarantee that both I a=
nd=20
Him (tm) dont see ambiguities.
So I never would write an expression like this.
       Nicola


--=20
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