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102  Articles
1 of 11 pages  |  10  records  |  more records»
In this paper, we obtain well-known B¨acklund transformations of several equationsv by applying Symmetries methods . We indicate by examples how symmetries of a system of differential equations . Also, these equations may be combined with a B¨acklund ... see more

Metric and curvature symmetries (Killing, homothetic, conformal, null convergence conditions...) of Riemannian, semi-Riemannian, and lightlike manifolds play an important role in theoretical physics, especially in general relativity. In the present paper,... see more

In this note we present some ideas on when Lie symmetries, both point and generalized, can depend on arbitrary functions. We show a few examples, both in partial differential and partial difference equations where this happens. Moreover we show that the i... see more

The concept of inertial frame of reference in classical physics and special theory of relativity is analyzed. It has been shown that this fundamental concept of physics is not clear enough.  A definition of inertial frame of reference is proposed whi... see more

While mechanics was developed under the idea of reciprocal action (interactions), electromagnetism, as we know it today, takes a form more akin to unilateral action. Interactions call for spatial relations, unilateral action calls for space, just one refe... see more

The bound state solutions of the deformed Klien-Gordon equation have been determined in the three-dimensional extended relativistic quantum mechanics 3D-ERQM symmetries using position-dependent mass (PDM) with unequal scalar and vector potential for the i... see more

Coloured graphical models are Gaussian statistical models determined by an undirected coloured graph. These models can be described by linear spaces of symmetric matrices. We outline a relationship between the symmetries of the graph and the linear f... see more

El objetivo de este texto es el de analizar las representaciones bisexuales que existen en Sex, de Beatriz Gimeno, y Gut Symmetries, de Jeanette Winterson, exponiendo los mitos y estereotipos asociados a esta realidad, y mediante una serie de referencias ... see more

A symmetry of a Riemann surface X is an antiholomorphic involution f. The species of f is the integer ek, where k is the number of connected components in the set Fix(f) of fixed points of f and e = -1 if X \ Fix(f) is connected and e = 1 otherwise. ... see more

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