The results of A. P. Calderón concerning unique continuation of solutions of elliptic equations with "simple characteristics" are proved, with some extensions, using the method of the first part of ...

The Cauchy problem for the Helmholtz equation has emerged as an important yet challenging subject in applied mathematics and engineering. This problem involves deducing interior solutions from ...

In this paper, we first introduce the perturbation conformable fractional differential equations and present a new variational iteration method for solving and investigating their solutions. In the ...

Cauchy problems and inverse problems in partial differential equations (PDEs) represent a class of challenging mathematical models where one seeks to determine unknown data inside a domain from ...