Source: wikibot/proof-that-pi-is-irrational
= Proof that π is irrational
{wiki=Proof_that_π_is_irrational}
The proof that π is irrational was first established by Johann Lambert in 1768. His proof is somewhat complex and relies on properties of continued fractions, but I can provide a high-level overview of the concepts involved in proving the irrationality of π. \#\#\# Overview of Lambert's Proof 1. **Definitions**: A number is irrational if it cannot be expressed as a fraction of two integers.