Nonstandard (disambiguation)

Nonstandard describes a state not conforming to standards.

Nonstandard or non-standard may also refer to:

non-standard analysis, the use of infinitesimals to formulate calculus
non-standard model, in model theory, a model that is not isomorphic to the standard model, especially models of Peano arithmetic
non-standard cosmology, models which do not conform to current scientific consensus

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