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- Path: shellx.best.com!not-for-mail
- From: awe@shellx.best.com (Alexander Berg)
- Newsgroups: comp.lang.pascal.borland,comp.lang.pascal.mac,comp.lang.pascal.ansi-iso,comp.lang.pascal.misc,comp.sys.amiga.programmer,comp.graphics.algorithms,comp.os.ms-windows.programmer.graphics,comp.sys.amiga.graphics
- Subject: Re: 3d programming
- Date: 20 Feb 1996 23:37:00 -0800
- Organization: Best Internet Communications
- Message-ID: <4gei2s$deo@shellx.best.com>
- NNTP-Posting-Host: shellx.best.com
- X-Newsreader: TIN [version 1.2 PL2]
-
- NOTE: NOTHING TO DO WITH THE ORINAL POST
- (I think his question was answered long ago!)
- Some people have touched on this:
- vector is an element of a special kind of set, a "vector space".
- A set by itself (like R^n) is not a vector space, it also needs some
- friends (a field of scalars, a rule for composition, a rule for
- multiplication) and some laws by which they all abide (the ten
- axioms for a vector space)
- At this point we are ready for some neat ideas...
-
- Does a vector have a length? No, note that a norm (or distance function)
- was not one of the required friends above!
-
- Does a vector have direction? Hmm After looking at the ten axioms in your
- old linear algebra book this should be a little easier to answer.
-
- What about points? Well, points are just elements in a set, so as
- such they only have a home, and quite possibly nothing else!
-
-
- GET REAL!!!
-
- When we start talking about n dimensional euclidean space (R^n)
- all of a sudden we introduce lots of structure to things and add
- many people to our circle of friends... but it's late and I am tired
- of entertaining (my good friends the vector and point are probably
- tired of so many people slandering them too (grin))
-
- Alex
-
- (A mathematician taking computer graphics for fun)
-
- Any mistakes are definitely my own!
-