Results 31 to 40 of about 530 (201)

Generating transformation semigroups using endomorphisms of preorders, graphs, and tolerances [PDF]

, 2010
Let ΩΩ be the semigroup of all mappings of a countably infinite set Ω. If U and V are subsemigroups of ΩΩ, then we write U≈V if there exists a finite subset F of ΩΩ such that the subsemigroup generated by U and F equals that generated by V and F.
Morayne, Michal, J.D. Mitchell, Mitchell, James David, Quick, M., Y. Péresse, M. Morayne, Peresse, Yann Hamon, Mitchell, J.D., Quick, Martyn, Morayne, M., M. Quick, Péresse, Y.   +11 more
core   +1 more source

Strong Convergence to Common Fixed Points for Countable Families of Asymptotically Nonexpansive Mappings and Semigroups

Fixed Point Theory and Applications, 2010
We prove strong convergence theorems for countable families of asymptotically nonexpansive mappings and semigroups in Hilbert spaces. Our results extend and improve the recent results of Nakajo and Takahashi (2003) and of Zegeye and Shahzad (2008) from ...
Kumam Poom, Wattanawitoon Kriengsak
doaj   +2 more sources

Maximal subgroups of free idempotent-generated semigroups over the full transformation monoid [PDF]

, 2011
Let Tn be the full transformation semigroup of all mappings from the set {1, . . . , n} to itself under composition. Let E = E(Tn) denote the set of idempotents of Tn and let e ∈ E be an arbitrary idempotent satisfying |im (e)| = r ≤ n − 2. We prove that
Ruskuc, N., Ruskuc, Nik, Gray, R, Gray, R.   +3 more
core   +1 more source

Permutations of a semigroup that map to inverses [PDF]

Semigroup Forum, 2013
14 ...
openaire   +4 more sources

Spectral mapping theorems for differentiable $$C_0$$ semigroups [PDF]

Rendiconti del Circolo Matematico di Palermo Series 2, 2020
Let $(T(t))_{t\geq 0}$ be a $C_0$ semigroup on a Banach space $X$ with infinitesimal generator $A$. In this work, we give conditions for which the spectral mapping theorem $σ_{*}(T(t))\backslash \{0\}=\{e^{λs}, λ\inσ_{*}(A)\}$ holds, where $σ_*$ can be equal to the essential, Browder and Kato spectrum.
Boua, Hamid, Karmouni, Mohammed, Tajmouati, Abdelaziz   +2 more
openaire   +2 more sources

Generating the full transformation semigroup using order preserving mappings [PDF]

, 2003
For a linearly ordered set X we consider the relative rank of the semigroup of all order preserving mappings O-X on X modulo the full transformation semigroup Ex. In other words, we ask what is the smallest cardinality of a set A of mappings such that =
Higgins, PM, Mitchell, James David, Ruskuc, Nikola   +2 more
core   +1 more source

Computing in matrix groups without memory [PDF]

, 2013
Funding: UK Engineering and Physical Sciences Research Council award EP/K033956/1Memoryless computation is a novel means of computing any function of a set of registers by updating one register at a time while using no memory.
Maximilien Gadouleau, Cameron, P., Gadouleau, Maximilien, Cameron, Peter Jephson, Gadouleau, M., Cameron, Peter, Fairbairn, Ben, Cameron, P.J., Peter J. Cameron, Ben Fairbairn, Gadoleau, M.   +10 more
core   +1 more source

A note on continuity of semigroups of maps [PDF]

Proceedings of the American Mathematical Society, 1975
An example is given of a separately continuous semigroup of transformations on Hilbert space which fails to be jointly continuous at t = 0
openaire   +2 more sources

Computing in permutation groups without memory [PDF]

, 2013
Funding: UK Engineering and Physical Sciences Research Council (EP/K033956/1)Memoryless computation is a new technique to compute any function of a set of registers by updating one register at a time while using no memory.
Maximilien Gadouleau, Cameron, P., Gadouleau, Maximilien, Cameron, Peter Jephson, Gadouleau, M., Cameron, Peter, Fairbairn, Ben, Cameron, P.J., Peter J. Cameron, Ben Fairbairn, Gadoleau, M.   +10 more
core   +1 more source

Amenability and fixed point properties of semi-topological semigroups of non-expansive mappings in Banach spaces [PDF]

, 2016
In this thesis we are interested in fixed point properties of representations of semi-topological semigroups of non-expansive mappings on weak and weak* compact convex sets in Banach or dual spaces.
Salame, Khadime
core   +5 more sources