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 Oct17 revised What is a closed chain (or circuit) that is used in solving a transportation problem (a special type of linear programming problem)? Link to MHB version. Oct17 suggested approved edit on What is a closed chain (or circuit) that is used in solving a transportation problem (a special type of linear programming problem)? Sep30 awarded Explainer May11 answered How to solve $\displaystyle \lim_{x \to 0} \sqrt{x^2 + x^3} \sin \frac{\pi}{x}$ using squeeze Theorem? May7 awarded Yearling Apr3 comment Inverse image of a Borel set is a Borel set under measurable function Wonderful! Many thanks. Apr2 comment Inverse image of a Borel set is a Borel set under measurable function Also, it is legal to form the expression $f^{-1}([-\infty,2))$, when the range of $f$ is $E$? Apr2 comment Inverse image of a Borel set is a Borel set under measurable function Forgive the newbie question here, but with the $E$ you've set up, and the indiscrete topology, would that induce a particular measure? Jan23 comment How can I show that three statements are not logically equivalent to another? I'm confused: your logical translation of the original premises into a single implication doesn't seem at all faithful. I would do this: $(p\lor q)\land (p \lor \neg q) \land (p \lor \neg r) \to r$. Jan23 comment How can I show that three statements are not logically equivalent to another? Couple of questions, then: 1. Are you using natural deduction? If not, what rules of inference are you allowed? 2. What is the definition of a "proof of invalidity" in your logical system? Jan23 answered How can I show that three statements are not logically equivalent to another? Dec16 awarded Revival Aug16 revised Strategies for Factoring Expressions with Four Terms Fixed sign error in first example for Idea 2. Aug16 comment Strategies for Factoring Expressions with Four Terms Very puzzling. The sign error is still there. I've submitted the edit again. Maybe it'll go through this time. I'm talking about the sign error in the $x^{2}-y^{2}-4x+4$ example - the first example for Idea 2. Aug16 suggested approved edit on Strategies for Factoring Expressions with Four Terms Aug16 awarded Enthusiast Aug15 suggested rejected edit on Strategies for Factoring Expressions with Four Terms Aug15 comment Strategies for Factoring Expressions with Four Terms I just noticed that your first example in Idea 2 has a sign error, I think. I've fixed that. Aug14 revised Taylor Polynomial in Multivariable Case Added chapter number to problem. Improved LaTeX and grammar. Aug14 suggested approved edit on Taylor Polynomial in Multivariable Case