[FoRK] Succinct Trig
Russell Turpin <
deafbox at hotmail.com
> on >
Tue Jul 4 19:57:03 PDT 2006
"Stephen D. Williams" <sdw at lig.net>:
>This is the most concise explanation I've ever seen. I had trig 25 years
>ago. (! What the??)
Damn, that makes me feel old. I'm puzzled by the comment:
"'Normal' was used in the Wright's day much the same way
we use 'perpendicular' today."
Still is. Or to be more specific, "normal" is a topological
generalization of "perpendicular." Normal vectors have a
cross-product of zero.
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