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❍✶❳❫❘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✾


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?
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