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Oct
8
revised Really large birthday problem as a spacefaring question.
latex and some other minor corrections
Oct
8
reviewed Approve Which statements are equivalent to the parallel postulate?
Oct
8
reviewed Approve Which statements are equivalent to the parallel postulate?
Oct
8
reviewed Approve Problem of $\pi$- and $\lambda$-systems
Oct
8
awarded  Custodian
Oct
8
reviewed Edit How is $ k+ 1 + \frac{1}{2}k(k+1) = \frac{1}{2}(k+1)(k+2)?$
Oct
8
revised How is $ k+ 1 + \frac{1}{2}k(k+1) = \frac{1}{2}(k+1)(k+2)?$
latex and some other minor corrections
Oct
7
comment $(u_1,\ldots,u_k,v_1,\ldots,v_l)$ is linearly ind. iff $\operatorname{span}(u_1,\ldots,u_k) \cap (\operatorname{span}(v_1,\ldots,v_l) = \{0\} $
math.stackexchange.com/questions/392636/…
Oct
5
revised Show that $A^{\dagger} A$ is strictly positive?
latex and some other minor corrections
Sep
30
comment find $\det(\det(A)B[\det(B)A^{-1}])$
@shuuichi_nitori Because A and B are square matrices of order 3.
Sep
30
comment find $\det(\det(A)B[\det(B)A^{-1}])$
@shuuichi_nitori I had added some more explanation to the answer.
Sep
30
revised find $\det(\det(A)B[\det(B)A^{-1}])$
Improved explanation.
Sep
30
answered find $\det(\det(A)B[\det(B)A^{-1}])$
Sep
19
reviewed Approve Combination Book Problem
Sep
19
reviewed Approve Proof that coprime cubes are divisible by $n$
Sep
15
comment Let $Y\sim\text{uniform}(0,1)$ and define $X=\min\{Y,1-Y\}$. What is the PDF of $X$?
Should not be surprising. If you look at your derivation, you will realize that either Y < 1/2 or > 1/2 and thus min will always lie in [0, 1/2] and it will be uniform.
Jun
26
awarded  Nice Answer
Jun
21
reviewed Approve Which relations are partial orders
Jun
20
answered How to prove that $\lim_{n\to\infty} \frac{1}{2}\tan(\frac{x}{2}) + … + (\frac{1}{2^{n}}) \tan(\frac{x}{2^{n}}) $ = $\frac{1}{x}-\cot(x)$
Jun
20
revised How to prove that $\lim_{n\to\infty} \frac{1}{2}\tan(\frac{x}{2}) + … + (\frac{1}{2^{n}}) \tan(\frac{x}{2^{n}}) $ = $\frac{1}{x}-\cot(x)$
fixing latex markup