Studies and Essays Presented to R. Courant on His 60th Birthday, Jan. 8, 1948

Abbildung algebraic angle Anniversary Volume 1948 applied arbitrary assume axes Axiom blade boundary bounded closed module coefficients condition consider constant contains convergence convex convex hull coordinates corresponding critical point curvature curves d₁ d₂ defined definition denote differential distance domain Dreieck dual module element equation Euclidean exists finite number follows formula geodesic gerade gibt given Green's theorem Halbstrahl Hence hyperbolic segment inequality integral interior lines interior points intersection isoperimetric isoperimetric inequality isoperimetric problem komplexe linear transformation Mannigfaltigkeit Math matrix metric space modus tollens normal null systems obtain P₁ plane point set positive problem proof Punkte radius Riemann surface rotation satisfy Satz Seite sequence shear lines solution spectrum Strecke structure theorem surface surface of revolution symplectic group theory tion transformation values variables vectors velocity vertex visual space Winkel zero zigzag function zwei