Abstract
If F : H → H is a C loc 2 -map in a real Hilbert space, sup u ∈ B( u 0, R) ∥[ F′( u)] −1∥ ⩽ m( R), and limsup R > 0 R m ( R ) = ∞ , then F is surjective.
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More From: Communications in Nonlinear Science and Numerical Simulation
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