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Monge equation : ウィキペディア英語版
Monge equation

In the mathematical theory of partial differential equations, a Monge equation, named after Gaspard Monge, is a first-order partial differential equation for an unknown function ''u'' in the independent variables ''x''1,...,''x''''n''
:F\left(u,x_1,x_2,\dots,x_n,\frac,\dots,\frac\right)=0
that is a polynomial in the partial derivatives of ''u''. Any Monge equation has a Monge cone.
Classically, putting ''u'' = ''x''0, a Monge equation of degree ''k'' is written in the form
:\sum_ P_(x_0,x_1,\dots,x_k) \, dx_0^ \, dx_1^ \cdots dx_n^=0
and expresses a relation between the differentials ''dx''''k''. The Monge cone at a given point (''x''0, ..., ''x''''n'') is the zero locus of the equation in the tangent space at the point.
The Monge equation is unrelated to the (second-order) Monge–Ampère equation.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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