Proper (often capitalized PROPER), a corrected release in response to a previously released online video or movie that contains transcoding or other playback errors.
In mathematics:
Proper map, in topology , a property of continuous function between topological spaces, if inverse images of compact subsets are compact
Proper morphism, in algebraic geometry, an analogue of a proper map for algebraic varieties
Proper transfer function, a transfer function in control theory in which the degree of the numerator does not exceed the degree of the denominator
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