Operators

Some articles on operators, operator:

Noncommutative Logic - Noncommutativity in Logic - Pomset Logic
... was proposed by Christian Retoré in a semantic formalism with two dual sequential operators existing together with the usual tensor product and par ...
Operator Product Expansion
... In quantum field theory, the operator product expansion (OPE) is a Laurent series expansion of two operators ... result of physical observables represented by operators ... result of making two physical observations at two points and, one can time order these operators in increasing time ...
Interaction Picture
... Whereas in the other two pictures either the state vector or the operators carry time dependence, in the interaction picture both carry part of the time dependence of observables ... Equations that include operators acting at different times, which hold in the interaction picture, don't necessarily hold in the Schrödinger or the Heisenberg picture ... This is because time-dependent unitary transformations relate operators in one picture to the analogous operators in the others ...