Infinite matroids have been defined by Reinhard Diestel and coauthors in such a way that this class is (together with the finite matroids) closed under dualization and taking minors. On the other hand, Andreas Dress introduced a theory of matroids with coefficients in a fuzzy ring which is – from a combinatorial point of view – less general, because within this theory every circuit has a finite intersection with every cocircuit. Within the present paper, we extend the theory of matroids with coefficients to more general classes of matroids, if the underlying fuzzy ring has certain properties to be specified.
Bland, R. G., and Vergnas, M. L. Orientability of matroids. J. Combin. Theory Ser. B24 (1978),94–123.
Bland, R. G., and Vergnas, M. L. Orientability of matroids. J. Combin. Theory Ser. B 24 (1978),94–123.)| false