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visits member for 2 years, 6 months
seen Mar 26 at 21:26

May
29
awarded  Yearling
Jun
24
accepted Proof an inequality
Jun
23
comment Proof an inequality
@Leonid Kovalev: I put the range in the edit, sorry.
Jun
23
asked Proof an inequality
Jun
23
revised Expression of the Hyperbolic Distance in the Upper Half Plane
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Jun
21
comment An elementary (?) minimization problem
An intuitive solution: make symmetry of one point respect to the straight line. The minimum distance from this symmetric point to the other point is a straight line. Then the curve with minimum length between the two points is comprised by two segments.
Jun
19
answered Lower bound on a function of probability distribution
Jun
19
revised Expression of the Hyperbolic Distance in the Upper Half Plane
added 212 characters in body
Jun
19
revised Expression of the Hyperbolic Distance in the Upper Half Plane
added 2 characters in body
Jun
19
answered Expression of the Hyperbolic Distance in the Upper Half Plane
Jun
18
revised Finding limits - function of three variables
added 46 characters in body
Jun
18
revised Finding limits - function of three variables
deleted 8 characters in body
Jun
18
revised Finding limits - function of three variables
added 167 characters in body
Jun
18
answered Finding limits - function of three variables
Jun
18
answered Chain rule and inverse in matrix calculus
Jun
15
answered Basis for orthogonal complement
Jun
14
comment The contraction of a maximal ideal of $A[[x]]$ is a maximal ideal of $A$?
...of finite-tailed Laurent series in x with coefficients in k...Why?
Jun
14
answered Finite groups of functions under function composition
Jun
14
comment In which case $M_1 \times N \cong M_2 \times N \Rightarrow M_1 \cong M_2$ is true?
This is a very hard question: For example, let $R=k\[x_1,\ldots,x_n\]$. If $P$ is projective module of finite rank and $P\oplus R^n\cong R^{n+m}$, then $P\cong R^m\ \ldots$ But this is the Serre's Conjecture!
Jun
13
comment The harmonic sum of coprime integers is not an integer.
@PeterTamaroff: +1 for the new set up. Nice!