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2. Lill's method - Wikipedia

   en.wikipedia.org/wiki/Lill's_method

   Finding roots −1/2, −1/ √ 2, and 1/ √ 2 of the cubic 4x 3 +2x 2 −2x−1 showing how negative coefficients and extended segments are handled. Each number shown on a colored line is the negative of its slope and hence a real root of the polynomial. To employ the method, a diagram is drawn starting at the origin.

3. Linear equation over a ring - Wikipedia

   en.wikipedia.org/wiki/Linear_equation_over_a_ring

   Let R be an effective commutative ring.. There is an algorithm for testing if an element a is a zero divisor: this amounts to solving the linear equation ax = 0.; There is an algorithm for testing if an element a is a unit, and if it is, computing its inverse: this amounts to solving the linear equation ax = 1.

4. Heaviside cover-up method - Wikipedia

   en.wikipedia.org/wiki/Heaviside_cover-up_method

   Set up a partial fraction for each factor in the denominator. With this framework we apply the cover-up rule to solve for A, B, and C.. D 1 is x + 1; set it equal to zero. This gives the residue for A when x = −1.

5. Relaxation (iterative method) - Wikipedia

   en.wikipedia.org/wiki/Relaxation_(iterative_method)

   Relaxation methods are used to solve the linear equations resulting from a discretization of the differential equation, for example by finite differences. [ 2 ] [ 3 ] [ 4 ] Iterative relaxation of solutions is commonly dubbed smoothing because with certain equations, such as Laplace's equation , it resembles repeated application of a local ...

6. Linear equation - Wikipedia

   en.wikipedia.org/wiki/Linear_equation

   Linear equations occur frequently in all mathematics and their applications in physics and engineering, partly because non-linear systems are often well approximated by linear equations. This article considers the case of a single equation with coefficients from the field of real numbers , for which one studies the real solutions.

7. Tarski's high school algebra problem - Wikipedia

   en.wikipedia.org/wiki/Tarski's_high_school...

   Wilkie's results from his paper show, in more formal language, that the "only gap" in the high school axioms is the inability to manipulate polynomials with negative coefficients. R. Gurevič showed in 1988 that there is no finite axiomatization for the valid equations for the positive natural numbers with 1, addition, multiplication, and ...