Use a real-world example to create a function, that is, something with a set of rules that is followed with different inputs.  Then discuss, what would the inverse of that function be?  (Ex. buying a drink from a vending machine, the vending machine is the function and takes as input your money and choice and gives as output your drink.  The inverse function would be you put in your drink and get back your money.)

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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 Use a real-world example to create a function, that is, something with a set of rules that is followed with different inputs.  Then discuss, what would the inverse of that function be?  (Ex. buying a drink from a vending machine, the vending machine is the function and takes as input your money and choice and gives as output your drink.  The inverse function would be you put in your drink and get back your money.)

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