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 Mar 19 revised Find two matrices $A,B$ such that $AB=0, BA\neq 0$. What can you say about $(BA)(BA)$? edited body; edited title Mar 16 revised If $A,B$ are invertible, show that $AB$ is invertible and express $(AB)^{-1}$ in terms of $A^{-1},B^{-1}$. added 376 characters in body Mar 13 revised Is it possible to prove uniqueness without using proof by contradiction? edited tags Nov 23 revised How did he went from $b_{12}$ to $\tan 2\varphi=\cfrac{2a_{12}}{a_{11}-a_{22}}$? deleted 2 characters in body Nov 21 revised On a non-standard approach to the classification of conics? deleted 1 character in body Nov 13 revised Archimedean integration of $x^3$? deleted 174 characters in body Nov 13 revised Archimedean integration of $x^3$? added 2 characters in body Oct 12 revised Is my proof of $-(-a)=a$ correct? rolled back to a previous revision Sep 30 revised How to go from $d= \left(\frac{A\cdot B}{B\cdot B} B,A \right)$ to $d=\frac{|A\cdot B|}{|B|}$? added 757 characters in body Sep 2 revised Given the tetrahedron $OABC$, find a condition on $a OA+ b OB + c OC$ such that this is always inside $ABC$. added 22 characters in body Aug 26 revised Is it possible to find the criminal with graph-theoretic methods? added 13 characters in body Aug 25 revised Is it possible to find the criminal with graph-theoretic methods? added 626 characters in body Aug 18 revised On the inner workings of induction? added 64 characters in body Aug 18 revised On the inner workings of induction? added 305 characters in body Aug 17 revised What's the purpose of this unknown (financial) math formula? added 2 characters in body Aug 9 revised Simple Derivative plus tricky algebraic expression to simplify? added 8 characters in body Aug 9 revised Bridge between High School Mathematics and University-level Mathematics? added 223 characters in body Aug 9 revised Bridge between High School Mathematics and University-level Mathematics? added 190 characters in body Aug 9 revised Bridge between High School Mathematics and University-level Mathematics? added 361 characters in body Aug 3 revised How do I express logical connectives with Nand? added 172 characters in body