A spectral perturbation problem and its applications to waves above an underwater ridge.
Kuznetsov, D.S. (2001)
Sibirskij Matematicheskij Zhurnal
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Kuznetsov, D.S. (2001)
Sibirskij Matematicheskij Zhurnal
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Marco Riccardi (2009)
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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].
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