Equa\c{c}\~oes diferenciais pantogr\'aficas: retardo proporcional

TL;DR

This paper introduces differential equations with proportional delay, discussing their motivation, fundamental properties, and highlighting open problems for future research.

Contribution

It provides a foundational overview of differential equations with proportional delay, including their basic properties and open questions.

Findings

Introduction of differential equations with proportional delay

Discussion of their basic properties

Presentation of open research problems

Abstract

We present initially the motivation, definition and basic properties of differential equations with proportional delay. In the last Section we present open problems.