Ask Your Question

pmd's profile - activity

2020-10-01 13:56:23 +0200 commented answer Defining 4jm Wigner symbols

Perfect, thanks for your help!

2020-10-01 13:55:54 +0200 answered a question Defining 4jm Wigner symbols

Perfect, thanks!

2020-10-01 13:55:31 +0200 received badge  Supporter (source)
2020-10-01 13:55:28 +0200 received badge  Scholar (source)
2020-09-30 23:23:55 +0200 received badge  Nice Question (source)
2020-09-30 23:01:38 +0200 received badge  Student (source)
2020-09-30 22:15:41 +0200 asked a question Defining 4jm Wigner symbols

Hi everyone,

I am a neophyte and I can't understand my error in spite of the many tutorials I have watched. I want to define the 4jm Wigner symbols, which should basically be defined as:

var('m') 
wigner_4j(j1,j2,j3,j4,j,m1,m2,m3,m4) = sum(wigner_3j(j1,j2,j,m1,m2,m)*wigner_3j(j,j3,j4,-m,m3,m4),m,-j,j)

I get plenty of errors that I can't fix. It is weird to me because the overall logic seemed good, as it works for instance when I define in a similar manner:

var('n')
b(p,q) = sum(binomial(p,n)*binomial(q,n),n,0,min(p,q))

Thanks for your help!