Matthew Pressland
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 Sep 25 reviewed Approve Propositional Logic - induction Sep 25 reviewed Reject Given only P(A), P(A or B), and P(B|A), can P(~A and B) be calculated? Sep 25 revised Statement: For every real number $x$, if $x^4 + 4x^2 - 4x$ is less than zero, then x must be a number between 0 and 1 added 218 characters in body Sep 25 revised Statement: For every real number $x$, if $x^4 + 4x^2 - 4x$ is less than zero, then x must be a number between 0 and 1 added 48 characters in body; edited title Sep 25 answered Statement: For every real number $x$, if $x^4 + 4x^2 - 4x$ is less than zero, then x must be a number between 0 and 1 Sep 25 answered How to show that $D_n$ is closed in $GL_n$ with respect to Zariski topology? Sep 25 comment How to show that $D_n$ is closed in $GL_n$ with respect to Zariski topology? Hint: the function which returns the $(i,j)$-th entry of a matrix is a polynomial function on $\mathrm{GL}_n$. Sep 25 reviewed Close Proving a boolean algebra question Sep 25 reviewed No Action Needed Mathematical model building with dependent and independent variables Sep 25 reviewed Reviewed problem related to duality theorem in linear programming Sep 25 reviewed Reviewed Strangeness when using different u's in u substitution to solve an integral Sep 25 reviewed No Action Needed Reason for correct method of solving $x^6=x^4$ versus an erroneous method Sep 25 comment Demystify integration of $\int \frac{1}{x} \mathrm dx$ @MarioCarneiro I wanted a citation for it being the most common, I had assumed that it was the definition at least somewhere! But it's still interesting to know that Spivak does things this way round. Sep 24 reviewed Reviewed Invertible sheaves and invertible classes in the Picard group Sep 24 reviewed Edit A Rank-One Reduction Formula Sep 24 revised A Rank-One Reduction Formula Some additional LateX Sep 24 revised Idempotents in $M_2(\mathbb{C})$ edited title Sep 24 comment linear transformation's geometric meaning I don't know a good resource off the top of my head, and I don't want to say things that are confusing or wrong, so I need some more time to work out what the best thing to say is - sorry. Sep 24 reviewed Approve Sum of series ${n\choose 2a}{a\choose 0}+ {n\choose {2a+2}}{{a+1}\choose 1} + {n\choose {2a+4}}{{a+2}\choose 2} + \ldots$ Sep 24 reviewed Reviewed Problem 3-26 in Spivak´s Calculus on Manifolds