User jkn - Stack Overflow

jkn

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Member since June 27 2013
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Last seen Aug 22 '16 at 17:48

Cool answers:

http://math.stackexchange.com/questions/21199/is-dy-dx-not-a-ratio/21209#21209

http://math.stackexchange.com/questions/74347/construct-a-function-which-is-continuous-in-1-5-but-not-differentiable-at-2/74383#74383

http://math.stackexchange.com/questions/21525/mathematical-precise-definition-of-a-pde-being-elliptic-parabolic-or-hyperbolic/21540#21540