gmresModule: LightKrylovD2D2: verifiedDerivatives / callbacks: not applicableGeneral linear-operator iterative solve; no matrix sparsity or definiteness is imposed by this record.Pinned source: src/IterativeSolvers/IterativeSolvers.f90Author examples/tests: test/Tests.f90Load checked GAMS driver: gams-lightkrylov-gmres-reference