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visits member for 2 years, 2 months
seen Jun 26 at 5:40

❍✶❳❫❘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✾


May
26
revised Measurement of the amplitude
added 23 characters in body
May
26
asked Measurement of the amplitude
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
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 .