# Problemaniac

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bio website problemania.org location Problemania age member for 2 years seen Aug 17 at 4:56 profile views 19

A moderator at Wiki site http://problemania.org where a group of enthusiasts enjoying sharing the fun solving mathematics, physics, and computing problems. We primarily work on problems found in college/grad school text books.

Web page: http://problemania.org

 Jul2 awarded Curious May19 revised How to solve this differential equation? added 8 characters in body May19 accepted How to solve this differential equation? May19 revised How to solve this differential equation? added 53 characters in body May19 revised How to solve this differential equation? deleted 2 characters in body May19 asked How to solve this differential equation? May19 asked How to measure the nonlinearity of a real-valued multivariate function? May17 awarded Teacher May16 answered How does WolframAlpha simplify sine and cosine? Apr6 comment “important” math concepts to pass on to next generation of creatures at some cataclysm If you add this explanation in the original answer, it probably would not get down votes. Apr6 revised “important” math concepts to pass on to next generation of creatures at some cataclysm added 23 characters in body Apr6 revised “important” math concepts to pass on to next generation of creatures at some cataclysm added 23 characters in body Apr6 revised “important” math concepts to pass on to next generation of creatures at some cataclysm added 179 characters in body; edited tags Apr6 awarded Yearling Apr6 awarded Critic Apr6 asked “important” math concepts to pass on to next generation of creatures at some cataclysm Mar22 accepted Why Euler-Lagrange equation does not depend on the second derivative of the function? Mar22 comment How to prove a Set category with at least one element is a separator? @BrunoStonek, thanks for reminding me of that. That's exactly right. A separator is for a category, and it separates any pair of two different morphisms. I'm trying to I've finally written down the reasoning more formally as a note. Mar17 accepted How to inverse this logic definition of separator of Set category? Mar17 comment How to inverse this logic definition of separator of Set category? Is $\bar{s}_3$ the correct answer?