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: Bob Ippolito <email@hidden>
- Date: Fri, 23 Apr 2004 12:15:40 -0400
On Apr 23, 2004, at 11:36 AM, David Blanton wrote:
On 4/23/04 8:10 AM, "Kay Roepke" <email@hidden> wrote:
On 23. Apr 2004, at 10:40 Uhr, Marco Scheurer wrote:
In my book "+" is used for, among other properties, commutative
operations. Here a+b is not the same as b+a.
Yeah...strings are obviously members of left- resp. right-modules
rather than of vectorspaces.
Aah, well...those were good times ;-)
Kay
+ is only commutative over certain sets ...
Consider matrix addition where A + B != B + A !
When did THAT happen? Did someone rotate your + glyph by 45 degrees? ;)
-bob
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