In
Examples of reduction systems include
When none of the reduction rules can be applied to a given expression, it is said to be in normal form.
See also
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Dolby noise-reduction system — A Dolby 361 A type noise reduction module Dolby NR is the name given to a series of noise reduction systems developed by Dolby Laboratories for use in analog magnetic tape recording. The first was Dolby A, a professional broadband noise reduction … Wikipedia
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