H. Kabayakawa
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 May29 awarded Yearling Jun24 accepted Proof an inequality Jun23 comment Proof an inequality @Leonid Kovalev: I put the range in the edit, sorry. Jun23 asked Proof an inequality Jun23 revised Expression of the Hyperbolic Distance in the Upper Half Plane deleted 1 characters in body Jun21 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. Jun19 answered Lower bound on a function of probability distribution Jun19 revised Expression of the Hyperbolic Distance in the Upper Half Plane added 212 characters in body Jun19 revised Expression of the Hyperbolic Distance in the Upper Half Plane added 2 characters in body Jun19 answered Expression of the Hyperbolic Distance in the Upper Half Plane Jun18 revised Finding limits - function of three variables added 46 characters in body Jun18 revised Finding limits - function of three variables deleted 8 characters in body Jun18 revised Finding limits - function of three variables added 167 characters in body Jun18 answered Finding limits - function of three variables Jun18 answered Chain rule and inverse in matrix calculus Jun15 answered Basis for orthogonal complement Jun14 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? Jun14 answered Finite groups of functions under function composition Jun14 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! Jun13 comment The harmonic sum of coprime integers is not an integer. @PeterTamaroff: +1 for the new set up. Nice!