@article {2017,
	title = {On contact interactions realised as Friedrichs systems},
	number = {SISSA;48/2017/MATE},
	year = {2017},
	abstract = {We realise the Hamiltonians of contact interactions in quantum mechanics within the framework of abstract Friedrichs systems. In particular, we show that the construction of the self-adjoint (or even only closed) operators of contact interaction supported at a fixed point can be associated with the construction of the bijective realisations of a suitable pair of abstract Friedrich operators. In this respect, the Hamiltonians
of contact interaction provide novel examples of abstract Friedrich systems.},
	url = {http://preprints.sissa.it/handle/1963/35298},
	author = {Marko Erceg and Alessandro Michelangeli}
}
