
A brief history of the Favard operator and its variants.- Bivariate extension of linear positive operators.- Positive Green's Functions for Boundary Value Problems with Conformable Derivatives.- The retraction-displacement condition in the theory of fixed point equation with...

A brief history of the Favard operator and its variants.- Bivariate extension of linear positive operators.- Positive Green's Functions for Boundary Value Problems with Conformable Derivatives.- The retraction-displacement condition in the theory of fixed point equation with...