SIAM Journal on Numerical Analysis, Vol. 12, No. 4 (Sep., 1975), pp. 617-629 (13 pages) The method of conjugate gradients for solving systems of linear equations with a symmetric positive definite ...

The technique utilized was the so-called "complementarity" or "fixed point" approach to the Brouwer fixed point theorem. In this paper we extend that approach to calculate for certain systems not just ...

Algebraic conditions for number of solutions. Solution of a pair of linear equations in two variables algebraically - by substitution, by elimination. Simple situational problems.