Results 121 to 130 of about 51,948 (159)

On the Geometry of Some Special Projective Varieties

Lecture Notes of the Unione Matematica Italiana, 2016
Providing an introduction to both classical and modern techniques in projective algebraic geometry, this monograph treats the geometrical properties of varieties embedded in projective spaces, their secant and tangent lines, the behavior of tangent linear spaces, the algebro-geometric and topological obstructions to their embedding into smaller ...
Francesco Russo
exaly   +3 more sources

Varieties of special algebras

Communications in Algebra, 1988
(1988). Varieties of special algebras. Communications in Algebra: Vol. 16, No. 9, pp. 1877-1919.
exaly   +2 more sources

On special amalgams and closed varieties of posemigroups

2022
Summary: In this paper we extend a result of \textit{H. E. Scheiblich} [Semigroup Forum 13, 103--114 (1976; Zbl 0355.20071)] by showing that variety of po-normal bands is closed. We also extend the well known results to posemigroups namely, that pogroups and inverse posemigroups have special amalgamation property in the category of all posemigroups and
Ahanger, S., Bano, S., Shah, A.
openaire   +2 more sources

Quasi-varieties: A special access

Studia Logica, 2004
The aim of this paper is to construct theories as the syntactical tools for modelling partial algebras by certain functors, analogous to Lawvere's categorical varietal approach. The theories chosen for this purpose are quasivarieties. Unfortunately, the definitions are too lengthy and technical to reproduce here, but I can mention the rather surprising
openaire   +2 more sources

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