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Some Doubly Nonlinear Evolution Equations in Banach Spaces

机译:Banach空间中的一些双重非线性发展方程

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The initial value problem is studied for the abstract evolution equation A(du/dt)+ B(u) contains f as a member, where A and B are maximal monotone operators from a Banach space W to its dual space W*, with A bounded and B unbounded. Assuming suitable coerciveness conditions, the existence of a solution is established when at least one of the operators is the subdifferential of a proper convex lower semicontinuous function. The existence theorems are shown by introducing a suitable time discretization of the problem and then passing to the limit by monotonicity and compactness. Uniqueness is proved when A or B is linear and symmetric and one of them is strictly monotone. Applications are indicated for classes of nonlinear partial differential equations and systems.

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