Feigenbaum constants
| Rationality | Unknown | 
|---|---|
| Symbol | δ and α | 
| Representations | |
| Decimal | 4.6692... and 2.5029... | 
In mathematics, specifically bifurcation theory, the Feigenbaum constants /ˈfaɪɡənbaʊm/ δ and α are two mathematical constants which both express ratios in a bifurcation diagram for a non-linear map. They are named after the physicist Mitchell J. Feigenbaum.