“…with complex numbers C qγ ıα,kβ that do not depend on the elementary boundary condition M. The latter numbers, which are obtained as traces on spaces of conformal blocks [37], can be used to define an associative multiplication on the space B A := ı∈I Hom A|A (U ı ⊗ + A ⊗ − U ī, A) of left-right symmetric bulk fields, i.e. they play the role of the structure constants of the algebra B A .…”