Self-adjoint extensions with Friedrichs lower bound
arXiv:2003.09631 · doi:10.1007/s11785-020-01032-z
Abstract
We produce a simple criterion and a constructive recipe to identify those self-adjoint extensions of a lower semi-bounded symmetric operator on Hilbert space which have the same lower bound as the Friedrichs extension. Applications of this abstract result to a few instructive examples are then discussed.