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inverse function
in·verse func·tion (plural in·verse func·tions)


noun 
Definition:
 
reverse of mathematical operation: a mathematical operation or function that exactly reverses another operation or function. Addition and subtraction are inverse functions.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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