Abstract A map $\mathcal {P} $ is tensor stable positive (tsp) if ${\mathcal {P}}^{\otimes n} $
is positive for all n, and essential tsp if it is not completely positive or completely co-positive …

The present paper shows how one might model Everettian quantum mechanics using
hyperfinitely many worlds. A hyperfinite model allows one to consider idealized …

We study a class of delta-like perturbations of the Laplacian on the half-line, characterized
by Robin boundary conditions at the origin. Using the formalism of nonstandard analysis, we …

Quantum resource theory is a cutting-edge tool used to study practical implementations of
quantum mechanical principles under realistic operational constraints. It does this by …

In the mid 1990s mathematicians Rolando Chuaqui and Patrick Suppes developed a
constructive axiomatic system of nonstandard analysis. This project, now called NQA+(later …

Ultrafunctions are a particular class of functions defined on a Non Archimedean field E⊃ R.
They have been introduced and studied in some previous works (Benci, in Adv Nonlinear …

In this paper, by using a hyperfinite dimensional space and time lattice (ST-lattice) of
nonstandard analysis, we present a variant of Bohmian interpretation of quantum mechanics …