Optimize Heff selection #6
Description
In SBRG.next, the current way to select Heff terms is:
if not ((term.mat.Xs | term.mat.Zs) & self.phybits):
May change to?
if not(term.mat.Xs) & not(term.mat.Zs & self.phybits):
Because Heff term can not have non-empty Xs.