what is a relation, and how do u find the inverse

Re: plez help

The statement that \(\displaystyle \Re\) is a relation from set \(\displaystyle A\) to set \(\displaystyle B\) means that \(\displaystyle \Re \subseteq A \times B\).

To find the inverse: \(\displaystyle \Re ^{ - 1} = \left\{ {(b,a):(a,b) \in \Re } \right\}\).
 
Re: plez help

zi zi said:
i dont get it..can you please explain again
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What is level of preparation for this topic?
What I gave is the standard set-theoretic definition of a relation.
Maybe you are not ready to tackle this topic.
It is usually a sophomore college level question.
 
zi zi said:
[W]hat is a relation, and how do [you] find the inverse[?]
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How does your book define a relation? (Look in the glossary in the back, and/or look up "relation" in the index in the back.)

What method does your book present for finding an inverse?

Are you supposed to restrict domains to obtain functions?

Are you in foundations, pre-calc, real analysis, or what?

(Either this was covered in class and/or in the book, so you can give us some feedback, or else you probably need to conference with your academic advisor regarding being assigned assessments over material which was not broached.)

Thank you! :D

Eliz.
 
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