Talk:Perpendicular/Archive 1
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| Archive 1 |
Strange results with imaginary numbers
I moved the following here. It needs more explanation if it is to go back on the article page, please. --345Kai 08:34, 19 April 2006 (UTC)
- This fact can also lead to strange (but correct) results with imaginary lines: e.g. the line y = ix is perpendicular with a line with ω = i, we see now that the line y = ix is perpendicular with itself! This seems odd but is nevertheless correct: imaginary lines can be seen as cubes in a 4-dimensional space.
- If this is because i*i = -1, then it can be explained without involving ω. I'm ignorant of the geometric explanation though. Pomte 16:06, 5 December 2006 (UTC)
UNICODE symbol
Is there supposed to be a UNICODE symbol for this??
U+221F (right angle) and U+22A5 (up tack) are the closest I can find ...but parallel to (U+2225) exists!
⊥ Symbol also used in logic and Haskell programming language
The ⊥ symbol, which redirects here, is also used in logic(meaning contradiction, see Table of logic symbols) and in the Haskell programming language documentation(meaning an unresolvable value). I actually only just discovered these uses, and I'm a wikipedia noob, so I don't feel confident enough to add any explanation to this page. If anyone else does, please do so. --219.121.95.124 (talk) 13:08, 22 April 2009 (UTC)
Geometric Dimensioning and Tolerancing
This article needs to reference the use of "perpendicularity" in Geometric Dimensioning and Tolerancing.
Something missing (text error)
The text says "use the SSS congruence theorem for ' and QPB' to " in order to prove perpendicularity, I'm not sure what needs to be before that first tick. — Preceding unsigned comment added by 71.191.226.78 (talk) 15:01, 26 December 2011 (UTC)