演講公告
新聞標題： ( 2013-03-19 )
演講主題：Some Results on Sign-balance of Restricted Permutations
主講人：傅東山 教授（屏東商業技術學院）
演講日期：2013年3月26日(星期二) 下午2:00 –3:00
演講地點：(光復校區) 科學一館223室
茶會時間：當天下午1:30 (科學一館205室)
摘要內容：
In a combinatorial approach, we present sign-balance results for two families of restricted permutations, 321-avoiding alternating permutations and simsun permutations. The proofs are based on a bijection between 321-avoiding alternating permutations and plane trees and a bijection between simsun permutations and increasing 1-2 trees, respectively.
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