Introduction
This section introduces some of the mathematical concepts used with PV‑WAVE.
Zeros of a Polynomial
A polynomial function of degree n can be expressed as follows:
p(z) = anzn + an–1zn – 1 + ... + a1z + a0
where an ≠ 0. Function ZEROPOLY finds zeros of a polynomial with real or complex coefficients using either the companion method or the Jenkins-Traub three-stage algorithm.
Zeros of a Function
Function ZEROFCN uses Müller’s method to find the real zeros of a real-valued function.
Root of System of Equations
A system of equations can be stated as follows:
fi(x) = 0, for i = 0, 1, ..., n – 1
where 
, and fi : Rn → R.
, and fi : Rn → R.Function ZEROSYS uses a modified hybrid method due to M.J.D. Powell to find the zero of a system of nonlinear equations.
