  I show how the Lindblad Plus equation will follow from the Feynman-Vernon
theory. The Plus refers to the inclusion of non-Markov processes in the
Lindblad equation resulting in an integro-differential general master equation.
The equivalence of this general master equation and not the Lindblad equation
alone to the Feynman-Vernon theory should be expected because the sum over
histories approach of the FV theory clearly includes non-Markov processes,
which Lindblad equation ignores. This should close the seeming gap between
these two approaches to quantum open systems.
