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Some theorems on Fredholm maps

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Let f : M → N f:M \to N be a C 1 {C^1} proper Fredholm map of index n of C r {C^r} Banach manifolds. Then under certain hypotheses one may approximate f by a C r {C^r} proper Fredholm map g of index n with g C 1 {C^1} properly homotopic to f . The rank theorem for Fredholm maps is stated and it is then used to obtain the invariance of domain for this class of maps and also a nonlinear version of the Fredholm alternative theorem.
Title: Some theorems on Fredholm maps
Description:
Let f : M → N f:M \to N be a C 1 {C^1} proper Fredholm map of index n of C r {C^r} Banach manifolds.
Then under certain hypotheses one may approximate f by a C r {C^r} proper Fredholm map g of index n with g C 1 {C^1} properly homotopic to f .
The rank theorem for Fredholm maps is stated and it is then used to obtain the invariance of domain for this class of maps and also a nonlinear version of the Fredholm alternative theorem.

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