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Topic: Square of a lower triangular matrix
Replies: 2   Last Post: Apr 14, 2013 6:12 PM

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Bart Goddard

Posts: 1,706
Registered: 12/6/04
Re: Square of a lower triangular matrix
Posted: Apr 14, 2013 6:12 PM
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HardySpicer <> wrote in news:41941a8a-bdaf-4676-bd6e-

> If I have a lower (say n square) triangular matrix T and I compute
> T^2 is there a proof which says that it too must be a lower triangular
> matrix with diagonal elements the square of the original?

Each element above the diagonal in the product is the dot product
of a row ending with m zeros and a column beginning with k zeros
where m+k >= n. The diagonal entries are dot products with only
one nonzero term.

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