Linear operators in spaces with indefinite metric and their applications

Dissipative operators and hyperbolic systems of partial differential equations

Ralph S. Phillips · Transactions of the American Mathematical Society · 1959 · 283 citations · Full text

Natural Sciences, Mathematics, Physics +16

On the iteration of closed geodesics and the sturm intersection theory

Raoul Bott · Communications on Pure and Applied Mathematics · 1956 · 281 citations

Natural Sciences, Mathematics, Geometry +6

Applications of the theory of quadratic forms in Hilbert space to the calculus of variations

Magnus R. Hestenes · Pacific Journal of Mathematics · 1951 · 207 citations · Full text

Natural Sciences, Mathematics, Applied Mathematics +10

On generalized resolvents and<i>Q</i>-functions of symmetric linear relations (subspaces) in Hilbert space

Heinz Langer, Björn Textorius · Pacific Journal of Mathematics · 1977 · 196 citations · Full text

Natural Sciences, Mathematics, Algebra +10

Applications of a theorem concerning sets with convex sections

Ky Fan · Mathematische Annalen · 1966 · 141 citations

Natural Sciences, Mathematics, Geometry +9