Maurer's homotopy theory and geometric algebra for even \(\Delta\)-matroids
For any matroid \(M\) over a finite set, an Abelian group called the Tutte group of \(M\) is defined ``which controls the representability of \(M\)''. This concept is now extended to even \(\Delta\)-matroids defined over sets of arbitrary cardinality.
scientific article; zbMATH DE number 885463