2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79450Consider two families of closed oriented curves in a d-manifold. At each point of intersecction of a curve of one family with a curve of the other family, form a new closed curve by going around the first curve and then going around the second. Typically, an i-dimensional family and a j-dimensional family will produce an (i+j-d+2)-dimensional family. Our purpose is to describe mathematical structure behind such interactions.29 pages, 8 figuresGeometric TopologyQuantum Algebra55N91; 57R19; 57R45; 17B81text