Re: [OT] Algebra (was: Re: Is Concatenation that complex?)
Re: [OT] Algebra (was: Re: Is Concatenation that complex?)
- Subject: Re: [OT] Algebra (was: Re: Is Concatenation that complex?)
- From: "Dennis C. De Mars" <email@hidden>
- Date: Fri, 23 Apr 2004 12:12:58 -0400
>
On 4/23/04 8:10 AM, "Kay Roepke" <email@hidden> wrote:
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>
> On 23. Apr 2004, at 10:40 Uhr, Marco Scheurer wrote:
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>
>
>> In my book "+" is used for, among other properties, commutative
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>> operations. Here a+b is not the same as b+a.
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>
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> Yeah...strings are obviously members of left- resp. right-modules
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> rather than of vectorspaces.
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> Aah, well...those were good times ;-)
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>
>
> Kay
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>
+ is only commutative over certain sets ...
>
Consider matrix addition where A + B != B + A !
You are thinking of matrix multiplication. Matrix addition is
commutative.
Getting back to the original topic, the use of + for concantenation is
a matter of taste. Personally, it doesn't bother me even though in
mathematics the + operator is typically commutative.
- Dennis D.
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