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Is heuristic reasoning okay, or should I make a rigorous proof?

easy proof...

Not for me. :P

yes for u only..

this is easy

tell me which text u refer

yeah...

do u have balagopal book?

yeah..

this is there in it!!

refer page 116

ya but the proof is very easy....

kkk

Lol, is that really an answer? Laaame.

no...it needs 3 d geometry....

what are u typing?

A rigorous mathematical proof by extending vectors. XD

Not including non-Euclidian, of course, because I don't know that stuff.

use balagopal book

Gah, I wish I had a tablet.

take it then...

bye..

thanks....