Function and inverses: Philosophy Forums

Function and inverses

Christim
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Joined: Feb 28, 2009

Total Topics: 17
Total Posts: 20

Posted 10/16/09 - 04:32 PM: Subject: Function and inverses	#1
Given a function f:A --> B, let T be a subset of B. The "inverse image" of T is written here as f-inv(T) and is defined as follows: f-inv(T) = {x in A \| EXISTS y in T, such that x is the preimage of y} Put another way, f-inv(T) = {x in A \| f(x) in T} Now suppose f:R --> R What is f-inv({x \| x>4}) ? Edited by Christim on 10/17/09 - 05:20 AM

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