On Wednesday, February 4, 2015 at 12:41:45 AM UTC+1, Aaron Meurer wrote: > > > But do they actually use summation convention, as if i=0.5..2.5 meant i = > 0.5, 1.5, 2.5? >
A spin state is usually represented by an N-dim vector, upon which act NxN matrices. The energies associated with these N entries correspond to N/2 to -N/2 times the reduced Planck constant. Sometimes, especially in the bra-ket notation, instead of using integers, one just uses the multiplication factor to the reduced Planck constant for the energies of those states as index, which may also appear in a sum. There are negative values, and if N is odd, they are half-integer. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/97e2f12c-8661-4df2-b891-81db502bad2b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
