Vogt–Russell theorem

The Vogt–Russell theorem states that the structure of a star, in hydrostatic and thermal equilibrium with all energy derived from nuclear reactions, is uniquely determined by its mass and the distribution of chemical elements throughout its interior.{{cite book| last1= Carroll| first1=Bradley W.| last2=Ostlie| first2=Dale A.| name-list-style=amp| title=An Introduction to Modern Astrophysics| publisher=Addison-Wesley| date=28 July 2006| page=333| edition=Second| isbn=978-0805304022}} Although referred to as a theorem, the Vogt–Russell theorem has never been formally proved. The theorem is named after astronomers Heinrich Vogt and Henry Norris Russell, who devised it independently.