Results 161 to 170 of about 937,852 (212)

Approximation theorems on graphs

Journal of Approximation Theory, 2021
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Chao Huang 0004   +3 more
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Approximating classical theorems

Journal of Logic and Computation, 1998
Approximation of classical theorems by constructive ones is considered. (By constructive proofs the authors understand those proofs that do not use the Excluded Middle principle.) The paper develops some ideas of G. Kreisel, P. S. Novikov and T. Coquand.
Baratella, Stefano, S. Berardi
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On the Dixmier Approximation Theorem

Proceedings of the London Mathematical Society, 1984
For a self-adjoint element A of a von Neumann algebra \({\mathcal R}\) let co(A) denote the convex hull of \(\{UAU^*| U\) unitary in \({\mathcal R}\}\). Let further \(co(A)^-\) and \(co(A)^ =\) be the weak and the norm closure of co(A), respectively.
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Approximation Theorems of Analysis

1999
This is an expository article about Dirac families. Applications include the theorem of Weierstrass on polynomial approximations of continuous functions, the result of Fejér-Cesàro on Fourier series, harmonic functions and Poisson families, and finally, solutions of the heat equation.
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