Partial fractions | Algebra | Elementary algebra

Partial fraction decomposition

In algebra, the partial fraction decomposition or partial fraction expansion of a rational fraction (that is, a fraction such that the numerator and the denominator are both polynomials) is an operation that consists of expressing the fraction as a sum of a polynomial (possibly zero) and one or several fractions with a simpler denominator. The importance of the partial fraction decomposition lies in the fact that it provides algorithms for various computations with rational functions, including the explicit computation of antiderivatives, Taylor series expansions, inverse Z-transforms, and inverse Laplace transforms. The concept was discovered independently in 1702 by both Johann Bernoulli and Gottfried Leibniz. In symbols, the partial fraction decomposition of a rational fraction of the form where f and g are polynomials, is its expression as wherep(x) is a polynomial, and, for each j,the denominator gj (x) is a power of an irreducible polynomial (that is not factorable into polynomials of positive degrees), andthe numerator fj (x) is a polynomial of a smaller degree than the degree of this irreducible polynomial. When explicit computation is involved, a coarser decomposition is often preferred, which consists of replacing "irreducible polynomial" by "square-free polynomial" in the description of the outcome. This allows replacing polynomial factorization by the much easier to compute square-free factorization. This is sufficient for most applications, and avoids introducing irrational coefficients when the coefficients of the input polynomials are integers or rational numbers. (Wikipedia).

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Johann Bernoulli | Exponentiation | Integral domain | Method of undetermined coefficients | Rational function | Z-transform | Fundamental theorem of algebra | Vector space | Linear algebra | Factorization | Clearing denominators | Antiderivative | Derivative | Indeterminate (variable) | Residue (complex analysis) | Taylor's theorem | Polynomial long division | Polynomial | Rational number | Symbolic integration | Algebra | Degree of a polynomial | Laplace transform | Discriminant | Laurent series | Linear map | System of linear equations | Limit (mathematics) | Monic polynomial | Integer | Real number | Multiplicity (mathematics) | Inverse Laplace transform | Square-free polynomial | Taylor series | Without loss of generality | Integral | Irreducible polynomial | Complex number | Charles Hermite | Computer algebra | Irrational number | Polynomial greatest common divisor | Scilab | Algorithm | Computer algebra system