Abstract
We introduce basic concepts and notation related to graphs, posets, abstract simplicial complexes, and matroids. In Section 2.1, we discuss graphs, digraphs, and hypergraphs. Section 2.2 is devoted to posets and lattices. We proceed with abstract simplicial complexes in Section 2.3 and conclude the chapter with some matroid theory in Section 2.4 and a few words about integer partitions in Section 2.5.
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