We find geometric conditions on a four-dimensional almost Hermitian manifold under which the almost complex structure is a harmonic map or a minimal isometric imbedding of the manifold into its twistor space.2010 Mathematics Subject Classification. Primary 53C43, Secondary 58E20, 53C28
In this article, we present an orthogonal
L
-contraction mapping concepts and prove a fixed point theorem on orthogonal complete Branciari metric spaces. As an application, we apply our major results to solving integral equations.
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