41. FEM then uses variational methods from the calculus of variations to approximate a solution by minimizing an associated error function. 42. He introduced the method of the critical points at infinity, which is a fundamental step in the calculus of variations . 43. In 1904, he published two more papers on the calculus of variations in the " Transactions of the AMS ". 44. From 1875 he worked at G�ttingen University, dealing with the subjects of complex analysis, differential geometry and the calculus of variations . 45. VSLib " ! provides deformable modeling as part of a library using the constrained optimization techniques of the calculus of variations . 46. The calculus of variations and level set methods can be used as a mathematical framework for investigating solutions of the problem. 47. In 1981, Kamien and Schwartz published " Dynamic Optimization : Calculus of Variations and Optimal Control in Economics and Management Science ." 48. His results agreed with those of Leonhard Euler but were more general and were derived without the means of calculus of variations . 49. A basic problem in the calculus of variations is finding the curve between two points that produces this minimal surface of revolution. 50. These works devoted to differential calculus and calculus of variations may be considered as the starting point for the researches of Weierstrass.
