cf.
https://www.researchgate.net/publication/325907723_A_gentle_introduction_to_Schwinger's_formulation_of_quantum_mechanics_The_groupoid_picture
*Schwinger’s picture of Quantum Mechanics*
https://arxiv.org/pdf/2002.09326.pdf
*In this paper we will present the main features of what can be called
Schwinger's foundational approach to Quantum Mechanics. The basic
ingredients of this formulation are the selective measurements, whose
algebraic composition rules define a mathematical structure called
groupoid, which is associated with any physical system. After the
introduction of the basic axioms of a groupoid, the concepts of observables
and states, statistical interpretation and evolution are derived. An
example is finally introduced to support the theoretical description of
this approach.*
Finally, we will introduce *a quantum measure* associated with the state ρ
First, we realize that the state ρ on C∗(G) defines a decoherence
functional D on the σ-algebra Σ of events of the groupoid G
We define a quantum measure µ on Σ
...
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