Results 301 to 310 of about 2,012,091 (336)

A Class of Degenerate Elliptic Equations

Journal of Mathematical Sciences, 2004
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Alkhutov, Yu. A., Zhikov, V. V.
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Equational classes of f-rings with unit: disconnected classes

Algebra universalis, 2009
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Injectivity in Equational Classes of Algebras

Canadian Journal of Mathematics, 1972
The concept of injectivity in classes of algebras can be traced back to Baer's initial results for Abelian groups and modules in [1]. The first results in non-module types of algebras appeared when Halmos [14] described the injective Boolean algebras using Sikorski's lemma on extensions of Boolean homomorphisms [19].
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Class of equivalent equations

Mathematical Notes of the Academy of Sciences of the USSR, 1967
It is shown that, for certain second-order linear homogeneous partial differential equations, there exists a set of equivalence transformations to the form Δ2u+c′(x)u = 0 in the metric of spaces conformal to the space Vn related to the equation. An element of this space is a transformation of the equation to the canonical form $$\Delta _2 u + \frac{{
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On a Class of Operator Equations

Mathematical Notes, 2001
This article deals with the equation \(a(x)=f(x)\) where \(a,f:E_1\to E_2\) are, respectively, a continuous surjective linear operator and a completely continuous nonlinear operator between Banach spaces \(E_1\) and \(E_2\); it is also assumed that \(\dim\text{ker}\,a\geq 1\). The author formulates simple and natural conditions under which the equation
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FUZZY EQUATIONAL CLASSES ARE FUZZY VARIETIES

Iranian Journal of Fuzzy Systems, 2013
In the framework of fuzzy algebras with fuzzy equalities and a complete lattice as a structure of membership values, we investigate fuzzy equational classes. They consist of special fuzzy algebras fullling the same fuzzy identities, dened with respect to fuzzy equalities.
Budimirovic, Branka, Budimirovic, Vjekoslav, Šešelja, Branimir, Tepavčević, Andreja   +3 more
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On equivalence classes of interpolation equations

1995
An Interpolation Equation is an equation of the form [(x)c 1 ... c n=b], where c 1 ... c n , b are simply typed terms containing no instantiable variable. A natural equivalence relation between two interpolation equations is the equality of their sets of solutions.
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Einstein-Maxwell field equations. Third class

Rendiconti del Circolo Matematico di Palermo, 1962
In this paper it has been shown that all the quantities excepting a parameter σ and charge can be determined from the field equations of general relativity, when the electromagnetic tensor field is of the third class. The parameter σ and the charge can be determined from Maxwell equations.
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Kirchhoff equations in $B^{k}_{\Delta}$ classes

Revista Matemática Complutense, 2009
The author studies the global solvability of the Cauchy problem for the Kirchhoff equation with non-ultradifferentiable initial data and forcing term. More precisely, he introduces the subclass \(B^k_\Delta\) of \[ H^{1+{k\over 2}}\times H^{{k\over 2}}\times L^1_{\text{loc}}([0,\infty); H^{{k\over 2}}) \] and proves for \(k= 1,2\) global existence and ...
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Equational compactness in equational classes of algebras

Algebra Universalis, 1972
Banaschewski, B., Nelson, E.
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