Results 31 to 40 of about 70 (62)

The diagonal of a pointed coalgebra and incidence-like structure

open access: yesJournal of Pure and Applied Algebra, 1985
Vector space decompositions of a pointed coalgebra C over a field reflecting properties of its diagonal map are used by Sweedler to classify the coalgebra, by Heyneman and Radford to discuss coreflexivity, and by Taft and Wilson to obtain results about Hopf algebras from the underlying coalgebra.
openaire   +1 more source

Periodic Points of Diagonal and Permutation Operators

open access: yes
We first give a condition for a normal operator on a Hilbert space to have no nonzero periodic points, then we give a characterization of normal operators with the whole space as periodic points. We proceed to study the structure of periodic points of the diagonal operators and the permutation operators with examples.
openaire   +2 more sources

Construction of diagonal quintic threefolds with infinitely many rational points

open access: yesMathematics of Computation
In this note we present a construction of an infinite family of diagonal quintic threefolds defined over Q \mathbb {Q}
openaire   +4 more sources

Rational Points on Diagonal Cubic Surfaces

open access: yesRational Points on Diagonal Cubic Surfaces
博士学位論文 (Thesis(doctor))
openaire  

Turning point problems of almost diagonal systems

open access: yesJournal of Mathematical Analysis and Applications, 1968
openaire   +1 more source

Campana Points on Diagonal Hypersurfaces

open access: yesAssociation for Women in Mathematics Series
19 pages; minor ...
Francesca Balestrieri   +2 more
exaly   +6 more sources

Diagonal fixed points in algebraic recursion theory

Archive for Mathematical Logic, 2005
In algebraic recursion theory diagonal fixed points originate from the so-called normal form theorem -- an analog of Kleene's normal form theorem in classical recursion theory. In this work a special type of partially ordered algebra, called intensional combinatory space, is considered.
openaire   +1 more source

The Locus for the Cross-Point of the Diagonals in a Pentagon

2020
Here we study the trajectories drawn by the points of intersection of the diagonals in a pentagon. When one side is fixed, and the remaining are mobile, there are two conducting elements. Taking two intersecting diagonals, the result is 5 trajectory-generating points. Mechanisms are built for all these cases and the trajectories found are drawn.
Iulian Popescu   +2 more
openaire   +1 more source

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