On the behavior of the interface separating fresh and salt groundwater in a heterogeneous coastal aquifer.
Challal, Samia, Lyaghfouri, Abdeslem (2003)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Challal, Samia, Lyaghfouri, Abdeslem (2003)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Belhachmi, Z., Brighi, B., Taous, K. (2000)
Acta Mathematica Universitatis Comenianae. New Series
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Goddard, Jerome, Lee, Eun Kyoung, Shivaji, Ratnasingham (2010)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Hernández, Jairo (2005)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Bouziani, Abdelfatah, Merazga, Nabil (2006)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Bravyi, Evgeniy I., Gusarenko, Sergey S. (2004)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Jin, Zhiren (2003)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Choquet, Catherine (2009)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Nguyen, Thanh Long, Bui, Tien Dung (2004)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Kuznetsov, D.S. (2001)
Sibirskij Matematicheskij Zhurnal
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de Cássia, Rita, Broche, D. S., de Oliveira, L. Augusto F., Pereira, Antônio L. (2003)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Dinca, George, Matei, Pavel (2007)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Marco Riccardi (2009)
Formalized Mathematics
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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].