Brian Borchers
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 Mar9 answered Why can we assume a certain term is $0$ in this case? Mar1 answered how to calculate variance on SVD parameter estimation? Sep24 awarded Autobiographer May16 comment What's wrong with this linear program formulation? Yes, you need to do some kind of phase I procedure to get a BFS. May16 answered What's wrong with this linear program formulation? Sep23 revised Difference between validity and satisfiability? Fixed an "A" vs. "F" typo Sep23 comment Difference between validity and satisfiability? Note that the term "valid" is also commonly used as an adjective to describe a proof in the propositional calculus. If you consider an expression in the propositional calculus to be a one line proof, then a tautology (an expression that is true under all assignments of the logical variables) is a valid proof. Sep23 answered Difference between validity and satisfiability? Jun28 answered Quadratic integer Programming May4 awarded Editor May4 revised What does it mean to integrate with respect to the distribution function? expanded the explanation. May4 answered What does it mean to integrate with respect to the distribution function? Dec7 awarded Yearling Feb3 comment $(A-λI)X=0$ works, but$(λI-A)X=0$ does not when finding eigenvectors. Why? What makes you think that $(\lambda I - A)x=0$ doesn't work? Are you responding to something that someone told you, or are you reporting that when you tried solving the equation it somehow didn't give you eigenvectors? Feb2 answered Is concavity of a real-valued function on a Euclidean space implied by concavity of its restriction to every lower dimensional affine subspace? Feb2 answered Best way to exactly solve a linear system (300x300) with integer coefficients Feb2 awarded Supporter Feb1 answered What is the norm measuring in function spaces Jan30 answered Difference between time series and stochastic process? Jan27 awarded Teacher