Czechoslovak Mathematical Journal
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On the integral representation of superbiharmonic functions
Czechoslovak Mathematical Journal - Tập 57 Số 3 - Trang 877-883 - 2007
Some Results about Dissipativity of Kolmogorov Operators
Czechoslovak Mathematical Journal - Tập 51 - Trang 685-699 - 2001
Given a Hilbert space H with a Borel probability measure ν, we prove the m-dissipativity in L
1(H, ν) of a Kolmogorov operator K that is a perturbation, not necessarily of gradient type, of an Ornstein-Uhlenbeck operator.
Hall exponents of matrices, tournaments and their line digraphs
Czechoslovak Mathematical Journal - Tập 61 Số 2 - Trang 461-481 - 2011
Evolution equations governed by Lipschitz continuous non-autonomous forms
Czechoslovak Mathematical Journal - Tập 65 - Trang 475-491 - 2015
We prove L
2-maximal regularity of the linear non-autonomous evolutionary Cauchy problem
$$\dot u(t) + A(t)u(t) = f(t){\text{ for a}}{\text{.e}}{\text{. }}t \in \left[ {0,T} \right],{\text{ }}u(0) = {u_0}$$
, where the operator A(t) arises from a time depending sesquilinear form a(t, ·, ·)......
Asymptotics of variance of the lattice point count
Czechoslovak Mathematical Journal - Tập 58 - Trang 751-758 - 2008
The variance of the number of lattice points inside the dilated bounded set rD with random position in ℝ
d
has asymptotics ∼ r
d−1 if the rotational average of the squared modulus of the Fourier transform of the set is O(ϰ
−d−1). The asymptotics follow from Wiener’s Tauberian theorem.
On the Stieltjes moment problem on semigroups
Czechoslovak Mathematical Journal - - 2002
We characterize finitely generated abelian semigroups such that every completely positive definite function (a function all of whose shifts are positive definite) is an integral of nonnegative miltiplicative real-valued functions (called nonnegative characters).
The primitive Boolean matrices with the second largest scrambling index by Boolean rank
Czechoslovak Mathematical Journal - Tập 64 - Trang 269-283 - 2014
The scrambling index of an n × n primitive Boolean matrix A is the smallest positive integer k such that A
k
(A
T)
k
= J, where A
T denotes the transpose of A and J denotes the n×n all ones matrix. For an m×n Boolean matrix M, its Boolean rank b(M) is the smallest positive integer ......
Properties of differences of meromorphic functions
Czechoslovak Mathematical Journal - Tập 61 - Trang 213-224 - 2011
Let f be a transcendental meromorphic function. We propose a number of results concerning zeros and fixed points of the difference g(z) = f(z + c) − f(z) and the divided difference g(z)/f(z).
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