It's a cocycle in group cohomology.
$S[f\circ g]= S[f]^g + S[g]$
which is the cocycle condition! The group is Aut(meromorphic functions) and the other group is meromorphic functions.
It's a cocycle in group cohomology.
$S[f\circ g]= S[f]^g + S[g]$
which is the cocycle condition! The group is Aut(meromorphic functions) and the other group is meromorphic functions.