... successive application
(composition) of two transformations of the form (15.8.4.1) with parameters ε
1
and ε
2
is
equivalent to a single transformation of the same form with parameter ε
1
+ ε
2
.
Further ... system
Figure 15.4. An algorithm for constructing invariant solutions for evolution second-order equations. Notation:
ODE stands for ordinary differential equation and PDE...
... Press, 1995 and
2003; A. D. Polyanin and A. V. Manzhirov, Handbook of Integral Equations, CRC Press,
1998; A. D. Polyanin, Handbook of Linear Partial Differential Equations for Engineers
and Scientists, ... compendium of mathematical
definitions, formulas, and theorems intended for researchers, university teachers, engineers,
and students of various backgrounds in...
... A ∩B stands for the intersection (com-
mon part) of sets A and B
⊂ inclusion; A ⊂ B means that the set A is part of the set B
⊆ nonstrict inclusion; A ⊆B means that the set A is part of the set ... of numbers a and b is denoted by a + b and has the property
a + b = b + a
– minus sign; the difference of numbers a and b is denoted by a – b
⋅ multiplication sign; the pro...
... r
1
(M
0
)andr
2
(M
0
) are the lengths of the focal radii of M
0
.
The tangent at an arbitrary point M
0
(x
0
, y
0
) of an ellipse forms acute angles ϕ
1
and ϕ
2
with the focal radii of the point of ... y) of an ellipse with the foci F
1
(–c, 0)andF
2
(c, 0)
are called the left and right focal radii of this point. We denote the lengths of the left and
right focal radii...
... to both spaces L
1
and L
2
.Such
elements form a subspace of V.
The sum of subspaces L
1
and L
2
of one and the same linear space V is, by definition,
the set of all elements of V that can be represented ... of matrices A and B consist of eigenvalues λ
j
and μ
k
, respec-
tively. Then the spectrum of the Kronecker product A ⊗ B is the set of all products λ
j
μ
k
.
T...
... Baltimore, Maryland, 1996.
Hazewinkel, M. (Editor), Handbook of Algebra, Vol. 1, North Holland, Amsterdam, 1996.
Hazewinkel, M. (Editor), Handbook of Algebra, Vol. 2, North Holland, Amsterdam, ... transformations,forwhichdetP =+1.
2. Improper orthogonal transformations,forwhichdetP =–1.
The set of proper orthogonal transformations forms a group called the special orthogonal
group o...
... S(t) is the boundary of the domain U(t), n is the unit normal to S(t), and v is the
velocity of motion of the points of S(t).
7.3.5-4. Some geometric and physical applications of the triple integral.
1. ... neither the
partition L
n
nor the selection of the points (x
i
, y
i
, z
i
), then it is called the line integral of
the first kind of the function f(x, y, z) over the...
... vectors of the tangent, of the binormal, and of the principal normal.
9.2. THEORY OF SURFACES 387
Varying the parameters u and v arbitrarily, we obtain the position vector and the coordi-
nates of ... the natural parameter s of the position vector of
a point of a curve is equal to the first derivative of the unit vector r
s
, i.e., of a vector of
constant length,...
... variables, x and t,wheret plays the
role of time and x is a spatial coordinate.
15.3.2. Traveling-Wave Solutions. Invariance of Equations Under
Translations
15.3.2-1. General form of traveling-wave ... solution of equation (15.2.3.8). Then the formulas (15.2.3.5) define
the corresponding solution of equation (15.2.3.7) in parametric form.
Remark. The Legendre transformation may r...
... generality of its
statements and the necessity of selecting differential constraints suitable for specific classes of equations. This
is why for the construction of exact solutions of nonlinear ... w), η = η(x, y, w), and ζ = ζ(x, y, w) are unknown functions, and the
coordinates of the first and the second prolongations ζ
i
and ζ
ij
are defined by formu-
las (15.8.1.9)...