例句與造句

1. Every partition matroid is the direct sum of a collection of uniform matroids, one for each of its blocks.
2. In some publications, the notion of a partition matroid is defined more restrictively, with every d _ i = 1.
3. Every uniform matroid U { } ^ r _ n is a partition matroid, with a single block B _ 1 of n elements and with d _ 1 = r.
4. The direct sum of matroids of these two types is a partition matroid in which every element is a loop or a coloop; it is called a "'discrete matroid " '.
5. It's difficult to find partition matroid in a sentence. 用partition matroid造句挺難的