An introduction to q-species

Details An introduction to q-species An introduction to q-species

2005-12-02

arxiv.org/abs/math/0512052v1

Electron. J. Combin. 12(1) (2005) #R62

Mathematics

Combinatorics

15 pages

Scientific paper

The combinatorial theory of species developed by Joyal provides a foundation for enumerative combinatorics of objects constructed from finite sets. In this paper we develop an analogous theory for the enumerative combinatorics of objects constructed from vector spaces over finite fields. Examples of these objects include subspaces, flags of subspaces, direct sum decompositions, and linear maps or matrices of various types. The unifying concept is that of a q-species, defined to be a functor from the category of finite dimensional vector spaces over a finite field with to the category of finite sets.

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