Theorie Invariantive du Calcul des Variations.
Paris: Gauthier-Villars Et Cie, Editeurs, 1930. 109 pp + separately paginated Applications sections, approx. 200 total pgs. 8vo. Paperback. In French. Sunned and edgeworn, lt soiled, crease to spine. Front cover detached but present, chipped at upper corners; chip to sp. head. P.o.'s name and date to title pgs, lt bump/crease to upper corner of some pgs. Text clean. Good Paperback (Item ID: 147934)