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visits member for 3 years, 10 months
seen Nov 24 '10 at 6:20

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.
Nov
23
asked Combinatorial proof of a binomial coefficient summation.