Beni Bogosel
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 Apr5 comment Computing $\langle\sin(\gamma_i)\rangle= \int_{(S^2)^N} \sin(\gamma_i)p(\Theta)dS$ Please explain clearly what you mean by $\langle\cdot\rangle$. in the beginning of the question you write it as an integral, then you use other formulas... Apr5 comment Computing $\langle\sin(\gamma_i)\rangle= \int_{(S^2)^N} \sin(\gamma_i)p(\Theta)dS$ What about the following remark on the second page: "Please do not disseminate these notes. They are only intended for internal use within the context of the course. This is the first version of these notes"?? Do you think your teacher will appreciate posting the file on a public site? Apr4 comment Vector spaces and intersections Nice counterexample. Apr3 comment Can all polygons outside of the largest inscribed rectangle in a convex polygon be concave Use the applet in the end of this page: cgm.cs.mcgill.ca/~athens/cs507/Projects/2003/DanielSud to see that this rectangle is maximal. Apr3 comment All polynomials with no natural roots and integer coefficients such that $\phi(n)|\phi(P(n))$ Is $\phi(n)$ the Euler function? Mar31 comment Showing $2^{n_2} + 3^{n_3}+\cdots+9^{n_9}$ is dense in $\mathbb{R}^+$ I used $a^{-\infty}=0$ to keep notations simple. Of course it is intended to be understood as a limit. Mar31 comment Showing a piece-wise function is differentiable everywhere/Clarification See this answer: math.stackexchange.com/a/47978/7327 You have a criteria to verify when a function defined on branches is differentiable. Mar31 comment In $\triangle ABC$, I is the incenter. Area of $\triangle IBC = 28$, area of $\triangle ICA= 30$ and area of $\triangle IAB = 26$. Find $AC^2 − AB^2$ @AGoogler: It's not really a method. You analyze what you're given and see what you can obtain out of that. Feb23 comment How do I solve $y'=\frac{x-y}{x+y}$? Look at the relation between the numerator and the denominator in the integral. What happens when you differentiate the denominator? Feb22 comment If $AB$ and $BA$ are invertible matrices, are $A$ and $B$ square matrices? Nice argument involving linear applications. Feb13 comment Car movement - differential geometry interpretation It is not my answer I link to. When the question was unanswered here, I cross-posted it to MathOverflow. Feb13 comment Car movement - differential geometry interpretation @janmarqz: I don't get it. What self promoting are you talking about? Feb13 comment Unreachable rubik cube positions. Rotate a corner clockwise (or anticlockwise) and you won't be able to reach that position. Jan31 comment Simpler proof - Non atomic measures @hot_queen: What do you mean? Jan17 comment proof of the full exchange lemma Your index notations may be wrong... for example $\lambda_r\neq 0$ for some $k \leq t$?? Jan17 comment proof of the full exchange lemma I guess you mean \$k