Kronecker delta


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Kronecker delta

(ˈkrɒnɪkə)
n
(Mathematics) maths a function of two variables, i and j, that has a value of zero unless i = j, when it has a value of unity. Symbol: δij
[named after Leopold Kronecker (1823–91), German mathematician]
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Noun1.Kronecker delta - a function of two variables i and j that equals 1 when i=j and equals 0 otherwise
function, mapping, mathematical function, single-valued function, map - (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)
References in periodicals archive ?
(Ms the total number of Lagrangian nodes on the RBC), [([F.sub.S]).sub.k] and [([F.sub.b]).sub.k] are elastic Lagrangian forces associated with the node k on the RBC and [[delta].sub.j,k] is the Kronecker delta function.
Here, [delta] is the generalized Kronecker delta. With definitions in (15), we can obtain the explicit form of the N-dimensional Nambu-Poisson brackets in terms of fields:
Indeed, the orthogonality condition requires that ([[phi].sub.i],[[phi].sub.j]) = [[delta].sub.ij], where [[delta].sub.ij] is the Kronecker delta. Since the [phi]i are normalized, the eigenpairs are as follows
In (2) and (3), E(*) is the expected value and [[delta].sub.k(k-i)] is Kronecker delta function.
where [DELTA][[epsilon].sup.a.sub.ij] are increments of the actual strain components, [DELTA][[sigma].sup.a.sub.ij] are increments of the actual stress components and [[delta].sub.ij] is the Kronecker delta, [DELTA][[epsilon].sup.pa.sub.eq] is the equivalent plastic strain increment, [DELTA][[sigma].sup.a.sub.eq] is the equivalent stress increment, where v is Poisson's ratio, E is elastic modulus, G is shear modulus, [E.sup.p.sub.T] is current value of generalized plastic modules and [S.sup.a.ij] are deviatoric stress compoenents.
where [delta] is the Kronecker delta function with [delta] ([S.sub.k], [S.sub.m]) =1 if [S.sub.k] = [S.sub.m] and 0 otherwise and [J.sub.km] is a positive constant that represents the grain boundary (km) energy.
where [u.sub.i](u, v, w) are nondimensional velocity components in the Cartesian-coordinate system [x.sub.1](x, y, z), p is a non-dimensional pressure, and [[delta].sub.ij] is the Kronecker delta (note that, for simplicity, the symbols for both dependent and independent variables have not been altered in switching from the dimensional to the dimensionless formalism).
,n] be the permutation matrix representing [sigma], where [delta] denotes the Kronecker delta. It is known that [Z.sup.AM.sub.[sigma]] (u) has the determinant expression
where [[sigma].sub.ij] is the tensor of mechanical stresses, [[epsilon].sub.ij] is the tensor of mechanical strains, u is the vector of mechanical displacements, f is the vector of the external volumetric forces, E is the temperature-dependent modulus of elasticity of the material, v is the temperature-dependent Poisson ratio of the material, [[delta].sub.ij] is the Kronecker delta, and e = [[epsilon].sub.kk] (k = i, j).
which is also sometimes expressed as the Kronecker delta. The other part of the boundary to the matrix yields a similar form, given by
with the Kronecker delta [[delta].sub.ij] and the viscosity [mu] [kg/ms].
The most common analytical approach used in forced vibration analysis is based on the assumed modes method in conjunction with the classical orthogonality conditions which may be expressed as [[integral].sup.L.sub.0] [Y.sub.i] [Y.sub.j] dx = [[delta].sub.ij], where L is the length of the beam, [Y.sub.i] and [Y.sub.j] are the fth and jth normal mode shapes, respectively, and [[delta].sub.ij] is the Kronecker delta function.