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age 24
visits member for 1 year, 10 months
seen Apr 4 at 4:41

❍✶❳❫❘➅❱❭➈❫❖❚✉❚▲❵➈♥✉➨↔ ➆✬❖✜❯❲❘➝❘❢❯❚❯❲❘❙➓➥✉ ❭ ▲❵❖➡✉❚❳➌❘✂✛✢✜ ❾✤✣✦✥✢✧★✪✩✚✫✭✬✜✯✮✱✰✳✲✩✵✴✷✶✸✩✺✹✼✻ ✲✩✸✻ s➨❍✶❳➌❘✡◗✜➆✬❘❙❴⑧▲❵➈❫➈Ñ➉✜❥✱P ➋ ❭✉❚❳➌❘❙❖❚➆✬❖❬➆✬❖➺❘❙➏❶❻❫➆❪➐❋▲❩❘❙➈✱✉➺✉ ❭ ✉❚❳❫❘✶❱❭➈➢➑➒❘❙❱❉✉❚❻❫❯❚❘➎✉❚❳❫▲❋✉✒↔ ➛➸❦❄s✾


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
accepted Why Liouville's theorem is obvious?
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
Jun
2
comment Why $\frac{d}{dt}r_{a}\nabla_{a}U_{ab}+\frac{d}{dt}r_{b}\nabla_{b}U_{ba}=\frac{d}{dt}U_{ab}?$
Thanks! This is helpful .
Jun
2
accepted Why $\frac{d}{dt}r_{a}\nabla_{a}U_{ab}+\frac{d}{dt}r_{b}\nabla_{b}U_{ba}=\frac{d}{dt}U_{ab}?$
Jun
2
awarded  Student
Jun
2
asked Why Liouville's theorem is obvious?
May
28
asked Why $\frac{d}{dt}r_{a}\nabla_{a}U_{ab}+\frac{d}{dt}r_{b}\nabla_{b}U_{ba}=\frac{d}{dt}U_{ab}?$