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A Counter Example to the Shuffle Compatiblity Conjecture

Ezgi Kantarcı Oğuz

Abstract

The shuffle product has a connection with several useful permutation statistics such as descent and peak, and corresponds to the multiplication operation in the corresponding descent and peak algebras. In their recent work, Gessel and Zhuang formalized the notion of shuffle-compatibility and studied various permutation statistics from this viewpoint. They further conjectured that any shuffle compatible permutation statistic is a descent statistic. In this note we construct a counter-example to this conjecture.

A Counter Example to the Shuffle Compatiblity Conjecture

Abstract

The shuffle product has a connection with several useful permutation statistics such as descent and peak, and corresponds to the multiplication operation in the corresponding descent and peak algebras. In their recent work, Gessel and Zhuang formalized the notion of shuffle-compatibility and studied various permutation statistics from this viewpoint. They further conjectured that any shuffle compatible permutation statistic is a descent statistic. In this note we construct a counter-example to this conjecture.

Paper Structure

This paper contains 1 section, 5 theorems, 5 equations, 1 table.

Table of Contents

  1. Introduction

Key Result

Proposition 1.2

Let $st$ be a shuffle compatible statistic. For $|\sigma|=|\phi| < 4$, $\mathrm{Des}(\sigma)=\mathrm{Des}(\phi)$ implies $st(\sigma)=st(\phi)$.

Theorems & Definitions (11)

  • Definition 1.1: MR3810249
  • Proposition 1.2
  • proof
  • Definition 1.3
  • Proposition 1.4
  • proof
  • Theorem 1.5
  • proof
  • Corollary 1.6
  • Definition 1.7: Grinbe
  • ...and 1 more