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In physics, the Schrödinger picture or Schrödinger representation is a formulation of quantum mechanics in which the state vectors evolve in time, but the operators (observables and others) are mostly constant with respect to time (an exception is the Hamiltonian which may change if the potential changes).
In quantum mechanics, the interaction picture (also known as the interaction representation or Dirac picture after Paul Dirac, who introduced it) [1] [2] is an intermediate representation between the Schrödinger picture and the Heisenberg picture.
All three of these choices are valid; the first gives the Schrödinger picture, the second the Heisenberg picture, and the third the interaction picture. The Schrödinger picture is useful when dealing with a time-independent Hamiltonian H , that is, ∂ t H = 0 {\displaystyle \partial _{t}H=0} .
where "H" and "S" label observables in Heisenberg and Schrödinger picture respectively, H is the Hamiltonian and [·,·] denotes the commutator of two operators (in this case H and A). Taking expectation values automatically yields the Ehrenfest theorem , featured in the correspondence principle .
Sociological images was founded in 2007 by sociology professor Lisa Wade (Occidental College) and hosted at Blogspot to share ideas and teaching resources with other faculty teaching about sociology. Six professors were invited to serve as the foundational bloggers.
The Social Construction of Reality: A Treatise in the Sociology of Knowledge (1966), by Peter L. Berger and Thomas Luckmann, proposes that social groups and individual persons who interact with each other, within a system of social classes, over time create concepts (mental representations) of the actions of each other, and that people become habituated to those concepts, and thus assume ...
For example, Engeström maintained that much of the success of the popular photo-sharing site Flickr was because photographs serve as social objects around which conversations of social networks form. [4] The concept was popularized by Hugh MacLeod, cartoonist and social observer in 2007. [5]
Visual sociology also requires the development of new forms—for example, data driven computer graphics to represent complex relationships e.g., changing social networks over time, the primitive accumulation of capital, the flow of labor, relations between theory and practice.