. "Swiss physicist" . "1909Z"^^ . "1878-02-22Z"^^ . "1909-07-07Z"^^ . . "Ritz, Walther"@en . . "Walther Ritz (22 February 1878 \u2013 7 July 1909) was a Swiss theoretical physicist.His father, Raphael Ritz, a native of Valais, was a well-known landscape and interior scenes artist. His mother was the daughter of the engineer Noerdlinger of T\u00FCbingen. Ritz studied in Zurich and G\u00F6ttingen. He is most famous for his work with Johannes Rydberg on the Rydberg\u2013Ritz combination principle. Ritz is also known for the variational method named after him, the Ritz method."@en . "1878Z"^^ . . . . "Walther Ritz"@en .