(no subject)
sum over shuffle sigma
sign of sigma times open bracket
A sigma one A sigma two
A sigma n close bracket
open bracket
A sigma n + 1 B one B two
B n - 1 close bracket
equals zero.
sign of sigma times open bracket
A sigma one A sigma two
A sigma n close bracket
open bracket
A sigma n + 1 B one B two
B n - 1 close bracket
equals zero.