Concepedia

Existence theorems for higher order nonlinear periodic boundary value problems

W. V. Petryshyn, Zining Yu

Nonlinear Analysis · 1982 · 33 citations · 10 references

DOI

Concepts

References

10

Equivalence theorems for nonlinear operator equations and coincidence degree theory for some mappings in locally convex topological vector spaces

Jean Mawhin · Journal of Differential Equations · 1972 · 194 citations

, , +6

Approximation methods and the generalized topological degree for nonlinear mappings in Banach spaces

Felix E. Browder, W. V. Petryshyn · Journal of Functional Analysis · 1969 · 139 citations

, , +11

On the approximation-solvability of equations involving 𝐴-proper and pseudo-𝐴-proper mappings

W. V. Petryshyn · Bulletin of the American Mathematical Society · 1975 · 123 citations · Full text

, , +2

Using degree theory for densely defined A-proper maps in the solvability of semilinear equations with unbounded and noninvertible linear part

W. V. Petryshyn · Nonlinear Analysis · 1980 · 39 citations

, , +11

Periodic solutions of nonlinear second-order differential equations which are not solvable for the highest derivative

W. V. Petryshyn, Zining Yu · Journal of Mathematical Analysis and Applications · 1982 · 26 citations

, , +9