A Variational Principle in Discrete Space-Time - Existence of Minimizers
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Submission date: 19. Apr. 2005
published in: Calculus of variations and partial differential equations, 29 (2007) 4, p. 431-453
DOI number (of the published article): 10.1007/s00526-006-0042-0
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We formulate a variational principle for a collection of projectors in an indefinite inner product space. The existence of minimizers is proved under general assumptions.