We will define the angle formed by each k-frame and each

unit vector and state the properties of angles.

The [xi]-sectional curvature K([xi],X) = g(R([xi],X) [xi],X) for a

unit vector field X orthogonal to [xi] plays an important role in the study of an almost contact metric manifold.

n](t) is the normal

unit vector to the boundary [partial derivative][OMEGA] and [p.

3], it is well-known that to each unit speed curve with at least four continuous derivatives, one can associate three mutually orthogonal

unit vector fields T, N and B are respectively, the tangent, the principal normal and the binormal vector fields [3].

q] is used, where q is the magnitude of the wave vector and ^q is a

unit vector.

the coordinates of the moment are derived as a result of the cross product of the radius vector [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] and the

unit vector [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] :

z]) is the

unit vector of the facet normal pointing to the air.

Next, suppose that there exists the

unit vector fields [[xi].

A non-lightlike isotropic vector is

unit vector if [y.

Now assume that U is a parallel

unit vector field with respect to the Levi-Civita connection, i.

The main features of radiative [beta]-decay have been derived in the classical approximation by Jackson [1] who assumes that an electron is created at the origin at t = 0 with constant velocity v = c[beta], in which case radiation of angular frequency [omega] is emitted in the direction of the

unit vector n with an angular distribution in energy per unit time per unit interval of angular frequency

0] represent, respectively, the wavenumber, the

unit vector normal to the surface, the free-space dielectric permittivity, the free-space magnetic permeability and the free-space impedance.