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I study the Nonlinear Schrodinger Equation.

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26 A ping-pong ball lying inside a wine glass Sep 25 '16
14 Interesting Olympiad Style Problem about Invariance Dec 30 '17
12 Why does this ln function inverse? Aug 31 '18
10 $f:A\to B$ and $g:B\to A$ two functions such that $f\circ g\circ f$ is bijective. Then so are $f, g$ Nov 5 '17
9 [Proof Verification]: The closure of a set is closed. Jan 23 '17
8 Find the probability that the thirteenth spade will appear before the thirteenth diamond? Sep 29 '18
6 Number of compositions of $n$ such that each term is less than equal to $k.$ Dec 28 '18
6 How to show that $\gcd(a_1,a_2,\cdots,a_k) = 1$ implies that there exist a non-negative solution to $\sum_{i=1}^{n}a_ix_i = n$ for large $n.$ Jan 2 '19
6 Interesting Olympiad style problem. Dec 30 '17
6 Is $f(x)=|x|$ a convex function? Sep 22 '16
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