240 reputation
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location Hamburg, Germany
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visits member for 3 years, 6 months
seen Nov 21 at 9:04

Oct
10
comment How to understand the unitary?
@Roger209: I meant mark as answer.
Oct
10
comment Why particle number operator $\hat{N}$ is $\hat{a}^\dagger\hat{a}$ rather than $\hat{a}\hat{a}^\dagger$?
@LePtC: This would only "shift" your problem...
Oct
10
comment How to understand the unitary?
@Roger209: Please, be so kind and mark the answer if it helped you.
Oct
10
awarded  Yearling
Oct
10
revised How to understand the unitary?
added 35 characters in body
Oct
10
answered How to understand the unitary?
Oct
10
answered Why particle number operator $\hat{N}$ is $\hat{a}^\dagger\hat{a}$ rather than $\hat{a}\hat{a}^\dagger$?
Jan
20
awarded  Editor
Jan
20
revised Noether Theorem and Energy conservation in classical mechanics
typo corrected
Jan
20
suggested suggested edit on Noether Theorem and Energy conservation in classical mechanics
Sep
30
awarded  Scholar
Sep
30
awarded  Supporter
Sep
30
accepted Covariant and contravariant vectors
Sep
29
awarded  Student
Sep
29
comment Covariant and contravariant vectors
@jinawee: The components $\omega_i$ of a 1-form $\omega$ are defined by $\omega_i(p)=\omega_p\left(\frac{\partial}{\partial x^i}|_p\right)$, so I do not understand your statement.
Sep
29
asked Covariant and contravariant vectors
Oct
22
awarded  Teacher
Jun
28
answered What is magnetic conductivity?