Operators

Some articles on operators, operator:

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 ...
Operator Product Expansion
... In quantum field theory, the operator product expansion (OPE) is a Laurent series expansion of two operators ... field theory one is interested in the result of physical observables represented by operators ... at two points and, one can time order these operators in increasing time ...
Frobenius Theorem (differential Topology) - Introduction
... a solution locally if, and only if, the operators Lk satisfy a certain integrability condition known as involutivity ... of proof of the Frobenius theorem is to form linear combinations among the operators Li so that the resulting operators do commute, and then to show that there is a coordinate system yi for which these are ...
Radio Amateur Civil Emergency Service - Participation
... officials who were not licensed amateur radio operators, limitations on the duration of non-emergency operation and stations that might be contacted were incorporated into part 97.407 ... would now use licensed amateur radio operators as control operators ... In daily practice, most amateur radio operators enrolled with their local government for possible operations under the RACES rules are also members of the Amateur Radio Emergency Service ...
Noncommutative Logic - Noncommutativity in Logic - Pomset Logic
... by Christian Retoré in a semantic formalism with two dual sequential operators existing together with the usual tensor product and par operators of linear logic, the first logic proposed to have both ...