Re: domain questionnaire
Date: Fri, 23 Feb 2001 18:02:17 GMT
Message-ID: <JAxl6.666$aw5.1233_at_www.newsranger.com>
In article <KFjl6.723$1f4.172983439_at_radon.golden.net>, Bob Badour says...
>Weight in lbs and *mass* in kgs are clearly different domains. However, mass
>in grams and mass in kgs could be the same domain with two different
>representations. Mass would have the same operators defined regardless of
>representation.
Well, your answer depends on Metric System we chose. In other words, in old English system we have dozens of domain. In <cm,g,sec> three only. But theoretical physis really operate with a system based upon a single unit! Therefore, if I pretend to be sophisticated, I must stick everything in a single domain. And I can compare mass with length, then (but this would led us into the black hole topic:-)
>Ideally, representation is independent of domain (or data type) to achieve
>the goal of physical independence.
Isn't representation dual to domain? I somehow amuse myself with equation
<60|kg> = <135|lb>
which is too similar to scalar product to ignore it.