Amancio Ortega owns a retail company.
In the mathematical subject of matroid theory , the bicircular matroid of a graph G is the matroid B -LRB- G -RRB- whose points are the edges of G and whose independent sets are the edge sets of pseudoforests of G , that is , the edge sets in which each connected component contains at most one cycle .. mathematical. mathematics. matroid. matroid. graph. Graph ( discrete mathematics ). connected component. connected component ( graph theory ). cycle. cycle ( graph theory ). The bicircular matroid was introduced by and explored further by and others .. matroid. matroid. It is a special case of the frame matroid of a biased graph .. matroid. matroid. graph. Graph ( discrete mathematics ). frame matroid. frame matroid. biased graph. biased graph