# On Pair Correlation of Sequences

## TL;DR

This paper surveys the concept of Poissonian pair correlation of sequences, discusses recent results, open problems, and introduces a multi-dimensional extension of PPC.

## Contribution

It provides a comprehensive overview of PPC, including recent developments and a new multi-dimensional version, highlighting open research directions.

## Key findings

- Survey of existing PPC results
- Introduction of multi-dimensional PPC
- Discussion of open problems in the field

## Abstract

We give a survey on the concept of Poissonian pair correlation (PPC) of sequences in the unit interval, on existing and recent results and we state a list of open problems. Moreover, we present and discuss a quite recent multi-dimensional version of PPC.