(adsbygoogle = window.adsbygoogle || []).push({}); Hello everybody. I started readin baby rudin a few days ago. And i came across equations 3 and 4 on page 2 of chapter 1. They seem a bit mysterious to me, does anybody know where did they come from?

Thanks in advance for your help

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Rudin's equation

**Physics Forums | Science Articles, Homework Help, Discussion**