# Soft Pions and More

## TL;DR

This paper reviews the historical and theoretical significance of soft pion theorems, current algebras, sum rules, and anomalies in establishing the foundations of the standard model of particle physics.

## Contribution

It provides a comprehensive overview of how these concepts contributed to the development of the standard model.

## Key findings

- Soft pion theorems helped understand low-energy pion interactions.
- Current algebras and sum rules linked symmetries to observable quantities.
- Anomalies clarified the consistency conditions of gauge theories.

## Abstract

I review the role that soft pion theorems, current algebras, sum rules, and anomalies played in the foundation of the standard model.