Mathematics – Combinatorics
Scientific paper
2000-07-31
Mathematics
Combinatorics
13 pages, 1 table
Scientific paper
In this paper, we find explicit formulas or generating functions for the cardinalities of the sets $S_n(T,\tau)$ of all permutations in $S_n$ that avoid a pattern $\tau\in S_k$ and a set $T$, $|T|\geq 2$, of patterns from $S_3$. The main body of the paper is divided into three sections corresponding to the cases $|T|=2,3$ and $|T|\geq 4$. As an example, in the fifth section, we obtain the complete classification of all cardinalities of the sets $S_n(T,\tau)$ for $k=4$.
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