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 Nov 26 accepted Finding a solution to $xu_x+(y+1)u_y=u-1$ given an initial condition Oct 2 awarded Yearling Aug 5 asked Proving that $L_{22}L_{22}^T=S$ is the Schur complement of a cholesky factorization Jul 21 accepted How to solve the system of equations $\{10^{-4}x_1+x_2=1, x_1+x_2=2\}$ using finite precision arithmetic with three significant figures? Jun 30 asked How to solve the system of equations $\{10^{-4}x_1+x_2=1, x_1+x_2=2\}$ using finite precision arithmetic with three significant figures? Jun 10 accepted USSR Exam problem Jun 10 comment USSR Exam problem I'm not sure how I ran into this problem, but my inability to arrive at enough equations currently causing me to doubt my abilities as a competent mathematician. Jun 9 revised USSR Exam problem added 76 characters in body Jun 7 asked USSR Exam problem May 28 asked Finding the mode of the negative binomial distribution May 28 accepted Finding the mode of a distribution May 27 asked Finding the mode of a distribution May 21 accepted A CD players plays songs until a certain artist is selected. May 21 comment A CD players plays songs until a certain artist is selected. I'm not sure I following cii. I thought that would be taken care of in ci. May 21 comment A CD players plays songs until a certain artist is selected. Also, I noticed I left off an index on (b). May 21 revised A CD players plays songs until a certain artist is selected. added 4 characters in body May 21 comment A CD players plays songs until a certain artist is selected. Right, (c) is like a new situation. May 21 asked A CD players plays songs until a certain artist is selected. May 19 comment Derivation of the moment generating function of the geometric distribution - why is this wrong? Yes. I kept not observing that this series began at 1 instead of 0. May 19 accepted Derivation of the moment generating function of the geometric distribution - why is this wrong?