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Jerry Chang's user avatar
Jerry Chang's user avatar
Jerry Chang
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I'm an undergraduate student at the National Chiao Tung University.

Here is my blog: https://mathjycg.wordpress.com/

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9
What is the area of a triangle with sides $\sqrt{5}$, $\sqrt{10}$, $\sqrt{13}$?
7
$G$ is an abelian group, and a permutation $T$. Suppose that $x-T(x)\neq y-T(y)$ for all $x\neq y$. Show that $p(x)=x-T(x)$ is also a permutation
6
About matrices whose row and column sums are 0
5
Given an algebra structure $(X,*)$ s.t. $(x*y)*y = y*(y*x) = x$ , prove$x*y=y*x$.