angle preserving transformations

by bigli
Tags: angle, preserving, transformations
bigli is offline
Jul11-07, 08:07 AM
P: 16
If x,y of R^n (as a normed vector space) are non-zero, the angle between x and y, denoted <(x,y), is defined as arccos x.y/(|x||y|).
The linear transformation T :R^n----->R^n
is angle preserving if T is 1-1, and for x,y of R^n (x,y are non zero) we have
<(Tx,Ty) = <(x,y).

what are all angle preserving transformations T :R^N---->R^N ?

I guess that answering to this quastion is connected with eigenvalues of T.please help me!!
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CompuChip is offline
Jul11-07, 09:51 AM
Sci Advisor
HW Helper
P: 4,301
Try looking up Hermitian operators somewhere.

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