Abstract
The method of the authors to solve elliptic boundary value problems with oblique and mixed, second derivative boundary conditions by decomposition into a self-adjoint first order system has been extended to situations in which first order chemical reaction is included in the differential equation and the boundary condition. This extension is indeed non-trivial and is applicable to a large variety of chemical engineering problems. The boundary conditions feature coefficients that are subject to a constraint for a self-adjoint formalism to accrue but one that is also imposed by the physics in the entire parameter space.
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