Estimation of directly unmeasurable external perturbations using functional observers perturbations from a mathematical point of view is equivalent to estimating some of the state variables
Gravitational perturbations in the expanding universe in a coordinate representationGravitational
perturbations in the expanding universe are analyzed within the framework
Descent method for monotone mixed variational inequalities mapping and a convex nondifferentiable function. We apply the Tikhonov-Browder regularization
technique Partial regularization method for nonmonotone variational inequalities problem with an arbitrary
perturbing mapping. The solution
technique combines partial regularization
A Perturbation of the de Rham ComplexWe consider a
perturbation of the de Rham complex on a compact manifold with boundary