Fréchet, Maurice Sur les lignes de discontinuité du plan tangent à une extrémale. (French) Zbl 0063.01441 Publ. Inst. Mat. Univ. Nac. Litoral 6, 137-144 (1946). Not reviewed MSC: 49-XX Calculus of variations and optimal control; optimization Keywords:ridge condition; nonparametric double integral problem Citations:JFM 25.0651.01 PDF BibTeX XML OpenURL