Displaying similar documents to “Bases in Sequence Spaces and Expansion of a Function in a Series of Power Series”

Identity surfaces.

Tutschke, W. (2000)

Zeitschrift für Analysis und ihre Anwendungen

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The theory and applications of complex matrix scalings

Rajesh Pereira, Joanna Boneng (2014)

Special Matrices

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We generalize the theory of positive diagonal scalings of real positive definite matrices to complex diagonal scalings of complex positive definite matrices. A matrix A is a diagonal scaling of a positive definite matrix M if there exists an invertible complex diagonal matrix D such that A = D*MD and where every row and every column of A sums to one. We look at some of the key properties of complex diagonal scalings and we conjecture that every n by n positive definite matrix has at...

On the Vallée-Poussin problem for singular differential equations with deviating arguments

Ivan Kiguradze, Bedřich Půža (1997)

Archivum Mathematicum

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For the differential equation u ( n ) ( t ) = f ( t , u ( τ 1 ( t ) ) , , u ( n - 1 ) ( τ n ( t ) ) ) , where the vector function f : ] a , b [ × R k n R k has nonintegrable singularities with respect to the first argument, sufficient conditions for existence and uniqueness of the Vallée–Poussin problem are established.