1995 | OriginalPaper | Chapter
Hilbert Spaces, Orthogonality, and the Dirichlet Principle
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In a famous paper from 1857, Riemann used the Dirichlet principle for the foundation of the theory of complex analytic functions. In 1870 Weierstrass showed that there are variational problems that do not have any solution.1 This way the justification of the Dirichlet principle became an important open problem, which Hilbert solved in 1900.