Displaying similar documents to “Perturbation of a solitary wave of the nonlinear Klein-Gordon equation.”

Solution of Cubic and Quartic Equations

Marco Riccardi (2009)

Formalized Mathematics


In this article, the principal n-th root of a complex number is defined, the Vieta's formulas for polynomial equations of degree 2, 3 and 4 are formalized. The solution of quadratic equations, the Cardan's solution of cubic equations and the Descartes-Euler solution of quartic equations in terms of their complex coefficients are also presented [5].