例句與造句

1. For this reason, regular matroids are sometimes also called "'unimodular matroids " '.
2. An example of this phenomenon is given by the regular matroids, matroids that are representable over all fields.
3. His contributions were plentiful, including the characterization of 1989 ) of Tutte's characterization of regular matroids .)
4. The binary matroids, matroids representable over the two-element finite field, include both graphic and regular matroids.
5. In matroid theory, he discovered the highly sophisticated chain groups and regular matroids, about which he proved deep results.
6. It's difficult to find regular matroids in a sentence. 用regular matroids造句挺難的
7. He ( with others ) was responsible for important progress on regular matroids and Hadwiger conjecture, and claw-free graphs.
8. The regular matroids are the matroids that can be defined from a totally unimodular matrix, a matrix in which every square submatrix has determinant 0, 1, or & minus; 1.
9. The equivalence of regular matroids and unimodular matrices, and their characterization by forbidden minors, are deep results of W . T . Tutte, originally proved by him using the Tutte homotopy theorem.
10. The graphic matroids, matroids whose independent sets are the forest subgraphs of a graph, have five forbidden minors : the three for the regular matroids, and the two duals of the graphic matroids for the graphs " K " 5 and " K " 3, 3 that by Wagner's theorem are forbidden minors for the planar graphs.