H. Kabayakawa
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 Feb 5 awarded Popular Question 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 deleted 1 characters in body 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!