MOC
2002
13 years 4 months ago
2002
For a linear ordinary differential equation the Lie algebra of its infinitesimal Lie symmetries is compared with its differential Galois group. For this purpose an algebraic formul...
MOC
2000
13 years 4 months ago
2000
Consider a differential equation y = A(t, y)y, y(0) = y0 with y0 G and A : R+
COMBINATORICS
2006
13 years 4 months ago
2006
We associate one or two posets (which we call "semistandard posets") to any given irreducible representation of a rank two semisimple Lie algebra over C. Elsewhere we ha...
CSJM
2008
13 years 4 months ago
2008
In a present paper a problem of classification of Aff(2, R)orbits' dimensions is considered on example of an autonomous two-dimensional affine differential system of first or...
ITSL
2008
13 years 6 months ago
2008
We explicitly determine quasi-polynomials describing the weight multiplicities of the Lie algebra so5(C). This information entails immediate complete knowledge of the character of ...