### 活動內容：

A partial permutation is an $n\times n$ 0,1-matrix with at most one 1 in each row and column. Catalan matrices, which is equivalent to orthogonal polynomials, is a useful tool in the study of partial permutations. In this talk, I will extend some well known statistics and results on permutations to partial permutations. In addition, results on certain families of permutations, for example, connected permutations and alternating permutations, are also mentioned.

### 活動時間：

2021/05/26 14:30 ~ 2021/05/26 16:30

### 報名時間：

2021/05/10 10:20 ~ 2021/05/25 17:00