Partial Differential Equations
Springer, 1982 - 249 páginas
This book is a very well-accepted introduction to the subject. In it, the author identifies the significant aspects of the theory and explores them with a limited amount of machinery from mathematical analysis. Now, in this fourth edition, the book has again been updated with an additional chapter on Lewy 's example of a linear equation without solutions.
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element and interpret it geometrically as consisting of a point ( x , y , z ) combined with a plane through the point with equation $ -z = p ( $ - x ) + qin ...
Let Lu O be a linear equation or system of equations with constant coefficients , for which the plane xn = 0 is non - characteristic .
A function G with domain R " is called a plane wave function , if its level surfaces form a family of parallel planes , that is if G can be expressed in the ...
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