Planeman
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 Nov 23 awarded Popular Question Jul 2 awarded Curious Nov 14 awarded Popular Question Mar 4 awarded Notable Question Feb 6 awarded Nice Question Oct 30 awarded Popular Question Dec 16 awarded Popular Question Nov 24 accepted Symmetric Matrix without $LDL^T$ Decomposition Nov 24 comment Symmetric Matrix without $LDL^T$ Decomposition Thank you both, it makes sense now. I was just not clear before on the use of the permutation matrix. Nov 24 accepted Proving theta complexity for floor function Nov 24 awarded Editor Nov 24 comment Symmetric Matrix without $LDL^T$ Decomposition So even if you need to use a permutation matrix to find the final result you don't consider that a decomposition of the original matrix? Nov 24 comment Symmetric Matrix without $LDL^T$ Decomposition Sorry about that I was mixing up my questions. Nov 24 revised Symmetric Matrix without $LDL^T$ Decomposition edited title Nov 24 comment Combinatorial proof of a binomial coefficient summation. @ Moron: I do understand that in learning it isn't always beneficial to be given the answer up front but in this case I had already been looking at this for several hours and the setup for the combinatorial proof is what was key to me making past that. Everything in the remaining cases is counting that I was already doing but I just couldn't connect it all. Nov 24 asked Symmetric Matrix without $LDL^T$ Decomposition Nov 23 accepted Combinatorial proof of a binomial coefficient summation. Nov 23 comment Combinatorial proof of a binomial coefficient summation. Wow that was a lot thank you. Give me a little time to process, usually this stuff comes back on tests so I want to understand it. Nov 23 awarded Commentator Nov 23 comment Combinatorial proof of a binomial coefficient summation. Sorry if I'm being really naive but I don't see where you get that from the equation above.