Closed-string level matching
= Closed-string level matching
{wiki=Closed_string}
Closed-string periodicity and the residual spatial constraint require equal left- and right-moving excitation levels, $N=\widetilde N$.
= Closed-string level matching
{wiki=Closed_string}
Closed-string periodicity and the residual spatial constraint require equal left- and right-moving excitation levels, $N=\widetilde N$.