158 reputation
5
bio website
location
age
visits member for 1 year, 3 months
seen Nov 13 '13 at 2:40

I'm a physics grad student studying baryogenesis and leptogenesis: basically why is there more matter than antimatter in the universe?


Jul
27
comment Examples of coupled 2nd time independent ODEs
Google is your friend: eqworld.ipmnet.ru/en/solutions/ode.htm , en.wikipedia.org/wiki/Examples_of_differential_equations , en.wikipedia.org/wiki/…
Jul
1
comment Permutations with fixed number of distinct elements
Then it would help if you listed a number of simple cases where you can do the counting by hand, just to make sure we know what the problem actually is. I based this on the question as read. Apologies if I misunderstood.
Jun
20
revised Permutations with fixed number of distinct elements
mentioned stirling numbers
Jun
20
revised Permutations with fixed number of distinct elements
added 110 characters in body
Jun
20
answered Permutations with fixed number of distinct elements
Jun
12
awarded  Teacher
Jun
12
awarded  Editor
Jun
12
revised How to solve the differential equation for the motion equation of a body in a gravitational field from one fixed source
fixed latex
Jun
12
comment Approximate solution for an ODE
Have you tried the math stackexchange? This site is for conceptual physics questions. Yours seems to be pure math. If you can physically motivate your problem that might lead to a useful approximation method. For instance, how do you know the leading behaviour of $\phi(l)$? What does it mean?
Jun
12
answered How to solve the differential equation for the motion equation of a body in a gravitational field from one fixed source
May
4
comment transitivity of commutator
Of course! Thanks. It seems obvious now. (Though note physicists usually say "nondegenerate" instead of simple.) "Physicists often assume that the Hermitian matrices that correspond to a quantum mesurement have only simple eigenvalues." I can't remember the particular problem being discussed in the lecture, but this certainly isn't true in general. I can think of many physics problems with degenerate eigenvalues.
May
4
awarded  Scholar
May
4
awarded  Supporter
May
4
accepted transitivity of commutator
May
3
awarded  Student
May
3
asked transitivity of commutator