# algebraic structure

(redirected from Algebraic system)

## algebraic structure

(mathematics)
Any formal mathematical system consisting of a set of objects and operations on those objects. Examples are Boolean algebra, numerical algebra, set algebra and matrix algebra.

References in periodicals archive ?
Using the 5-point finite difference scheme, (16) is reduced to the following algebraic system:
The matrix in a linear algebraic system obtained from a Shishkin mesh discretization of a singularly perturbed convection-diffusion equation is nonsymmetric and often highly nonnormal and ill-conditioned.
We carry out a direct substitution of (4) into (3) and gather the coefficients of the resulting polynomial in x, y, t, and z, to obtain a nonlinear algebraic system in [[alpha].sub.k].
To solve a nonlinear algebraic system (3), the method of extension by parameter in conjunction with the iterative Newton method is applied.
For converting the system of integral equations to an algebraic system, at first by means of change of variables in the system and in conditions (15) we reduce all the integration integrals to one interval [-1;1].
This leads to the nonlinear algebraic system of equations: [mathematical expression not reproducible] (A2)
The new algebraic system of equations can be written in form given in (10):
So the sparsity of the Jacobian matrix based on these different basis functions indicates how to solve the nonlinear algebraic system. Next, we give the formulation for two kinds of wavelet bases.
Step 4 collecting all the terms with the same power of [e.sup.[alpha][xi]] yields a set of algebraic system for [a.sub.i], [b.sub.i](i = 0, 1, ..., 2m), [alpha], where [a.sub.i], [b.sub.i](i = 0, 1, ..., 2m), [alpha] are coefficients to be determined later;
In order to find an algebraic system of four equations with four unknowns, it is necessary to integrate over the area (r,[theta]), where r = [0,a], and [theta] = [0,27[pi]], by using the orthogonal-relations [[integral].sup.2[pi].sub.0] cos(n[theta]) cos(n'[theta])d[theta] = [pi][[delta].sub.nn]', [[integral].sup.2[pi].sub.0] sin(n[theta]) sin(n'[theta])d[theta] = [pi][[delta].sub.nn]', and [[integral].sup.2[pi].sub.0] sin(n[theta]) cos(n'[theta])d[theta] = 0, where [[delta].sub.nn]' is the Kronecker delta which equals unity for n = n', and zero otherwise [13].
By solving the algebraic system (7), we obtain [[phi].sup.I.sub.ki] in n distinct points from the boundary of [L.sub.0].

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