Results 161 to 170 of about 146,027 (294)

Tetrahedral chains and a curious semigroup

open access: yesExtracta Mathematicae, 2019
In 1957 Steinhaus asked for a proof that a chain of identical regular tetrahedra joined face to face cannot be closed. Świerczkowski gave a proof in 1959.
Ian Stewart
doaj  

Semigroup of endomorphisms of a locally compact group [PDF]

open access: bronze, 1958
Morikuni Gotô, Naoki Kimura
openalex   +1 more source

Weighted pseudo-almost periodic solutions for some neutral partial functional differential equations

open access: yesElectronic Journal of Differential Equations, 2012
In this article we study the existence of weighted pseudo almost periodic solutions of an autonomous neutral functional differential equation with Stepanov-Weighted pseudo almost periodic terms in a Banach space.
Mondher Damak   +2 more
doaj  

New approach to streaming semigroups with multiplying boundary conditions

open access: yesElectronic Journal of Differential Equations, 2008
This paper concerns the generation of a C_0-semigroup by the streaming operator with general multiplying boundary conditions. A first approach, presented in [2], is based on the Hille-Yosida's Theorem.
Mohamed Boulanouar
doaj  

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