Inscientific modeling, atoy model is a deliberately simplistic model with many details removed so that it can be used to explain a mechanism concisely. It is also useful in a description of the fuller model.
Intoy mathematical models used inmathematical physics, this is usually done by reducing or extending the number of dimensions or reducing the number of fields/variables or restricting them to a particular symmetric form.[1]
Intoyeconomic models, some may be only loosely based on theory, others more explicitly so. They allow for a quick first pass at some question, and present the essence of the answer from a more complicated model or from a class of models. For the researcher, they may come before writing a more elaborate model, or after, once the elaborate model has been worked out. Blanchard's list of examples includes theIS–LM model, theMundell–Fleming model, the RBC model, and the New Keynesian model.[2]
Newtonianorbital mechanics as described by assuming that Earth is attached to the Sun by an elastic band;
theSchwarzschild metric, general relativistic model describing a single symmetrical non-rotating non-charged concentration of mass (such as a perfect spherical mass): a simple relativistic "equivalent" of the classical symmetric Newtonian mass (in fact, the firstsolution of the Einstein field equations to be developed);
