Results 191 to 200 of about 551 (224)

Iterated discriminator varieties have undecidable theories

Algebra Universalis, 1985
The author establishes a fairly wide class of discriminator varieties with undecidable theories. The result generalizes the most important example, namely, the variety \(CA_ 1\) of monadic algebras.
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Conditional geometric scales of discriminator varieties

Siberian Mathematical Journal, 2011
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Countable embeddability skeletons of discriminator varieties

Algebra and Logic, 1989
Let \({\mathbb{V}}\) be a variety of algebras. The set I\({\mathbb{V}}\) of isomorphism types of \({\mathbb{V}}\)-algebras together with the quasi-order \(\leq\) defined by the condition \(a\leq b\) iff any algebra of isomorphism type a can be embedded into some algebra of isomorphism type b, is called the embeddability skeleton of \({\mathbb{V ...
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Vine variety discrimination with airborne imaging spectroscopy

SPIE Proceedings, 2007
We aim at the discrimination of varieties within a single plant species (Vitis vinifera) by means of airborne hyperspectral imagery collected using a CASI-2 sensor and supervised classification, both under constant and varying within-scene illumination conditions.
M. Ferreiro-Armán, J. L. Alba-Castro, S. Homayouni, J. P. da Costa, J. Martín-Herrero   +4 more
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Projective Dual Varieties and General Discriminants

1994
We denote by P n the standard complex projective space of dimension n. Thus a point of P n is given by (n + 1) homogeneous coordinates (x 0:...: x n ), x i ∈ C, which are not all equal to 0 and are regarded modulo simultaneous multiplication by a non-zero number.
Israel M. Gelfand, Mikhail M. Kapranov, Andrei V. Zelevinsky   +2 more
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Congruence systems in dual discriminator varieties

Algebra universalis
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Campercholi, Miguel, Castaño, Diego, Zigarán, Gonzalo   +2 more
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Expansions of Semi-Heyting Algebras I: Discriminator Varieties

Studia Logica, 2011
This paper is a contribution toward developing a theory of expansions of semi-Heyting algebras. The paper has the following objectives:{\parindent=6mm \begin{itemize}\item[(1)] To prove the validity of the following conjecture: There exists a variety \textbf{V} of algebras which would provide a unifying framework to state and prove results which would ...
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Elementary theory of embeddability skeletons of discriminator varieties

Siberian Mathematical Journal, 1992
See the review in Zbl 0756.08003.
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Discriminant varieties and discriminant ideals for operator vessels in Banach space

Integral Equations and Operator Theory, 1995
A multivariate analogue of the theory of characteristic functions (for single linear operators) was advocated for several decades by M. S. Livšic and his school. In particular he has created the notion of a commutative operator vessel, which indeed encodes the expected features of a characteristic function for commutative \(n\)-tuples of Hilbert space ...
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Rich countable epimorphism skeletons of discriminator varieties

Siberian Mathematical Journal, 1991
More or less completing his results from previous papers, the author shows that a discriminator variety \({\mathfrak M}\) which is not finitely generated but either has finite signature or has singleton subalgebras of all its algebras is universal for countable quasiordered sets S, i.e.
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