Involution sets, graphs with parallelism and loops

This is a general frame for a theory which connects the areas of loops, involution sets and graphs with parallelism. Our main results are stated in Sections 4, 5 and 6. In Section 4 we derive a partial binary operation from a bipartite involution set and we discuss if such operation is a Bol operation or a K-operation, in Section 5, Section 6 we relate involution sets with loops.