Bombyx mori
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 Feb 28 accepted Why Liouville's theorem is obvious? Sep 24 awarded Autobiographer Aug 5 revised Why would the apple fall under the tree? added 657 characters in body Aug 3 asked Why would the apple fall under the tree? Apr 22 comment Lebesgue integration @user5462: I would encourage you to learn it any way, it is abstract but is useful for many purposes. Once you know real analysis and functional analysis well, you are prepared to study more advanced mathematical physics, which often involve a fair amount of PDE. Apr 22 comment Lebesgue integration I think this is a good question, but might be more suitable for math.stackexchange. Apr 22 awarded Commentator Jun 11 accepted What is the Lie algebra of the Galilean group and what is the structure of it? Jun 8 comment What is the Lie algebra of the Galilean group and what is the structure of it? Thank you, this is very helpful. Jun 8 asked What is the Lie algebra of the Galilean group and what is the structure of it? Jun 5 comment Why Liouville's theorem is obvious? @RonMaimon: A double-check of the author's proof verified your claim, thanks. Jun 3 comment Why Liouville's theorem is obvious? @RonMaimon: I mean by realizing the determinant is 1, the proof just follows. It is easier than working with the mixed partial derivatives. Jun 3 comment Why Liouville's theorem is obvious? Thanks! (I realized this myself). Jun 3 comment Why Liouville's theorem is obvious? @RonMaimon: Thanks, did as you suggested. Jun 3 answered Why Liouville's theorem is obvious? Jun 2 awarded Editor Jun 2 revised Why $\frac{d}{dt}r_{a}\nabla_{a}U_{ab}+\frac{d}{dt}r_{b}\nabla_{b}U_{ba}=\frac{d}{dt}U_{ab}?$ corrected the book name Jun 2 awarded Supporter Jun 2 comment Why Liouville's theorem is obvious? @Ron Maimon: This is helpful, but not so transparent to a layman like me (who learned Possion bracket yesterday). So I have to spend some time to understand this. Thanks for the help. Jun 2 awarded Scholar