Yang Li

activity

20232025

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math.CO2025

A bijection between $321$ - and $213$ -avoiding permutations preserving $t$ -stack-sortability

Yang Li, Sergey Kitaev, Zhicong Lin +1

We construct a bijection between $321$ - and $213$ -avoiding permutations that preserves the property of $t$ -stack-sortability. Our bijection transforms natural statistics between th…

math.CO2025

Bijections in weakly increasing trees via binary trees

Yang Li, Zhicong Lin

As a unification of increasing trees and plane trees, the weakly increasing trees labeled by a multiset was introduced by Lin-Ma-Ma-Zhou in 2021. Motived by some symmetries in plan…

A bijection between 321- and 213-avoiding permutations preserving t-stack-sortability

Bijections in weakly increasing trees via binary trees

A bijection between $321$ - and $213$ -avoiding permutations preserving $t$ -stack-sortability