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I got a Logic final in 1 hour. Quick question
TheSonicRetard
Registered User regular
Registered User regular
I have my final in 1 hour, and I'm ready for just about all of it.
Except, while reviewing all my old homework, I came across a problem that I didn't remember how to do. It was involving inverse relations.
I can't find inverse relations in my notes. Can anyone explain them to me?
Like say I have a set A = {1, 2, 3} and R is a relation on A such that R = {(1, 2), (2, 3)}.
What is R^-1?
Except, while reviewing all my old homework, I came across a problem that I didn't remember how to do. It was involving inverse relations.
I can't find inverse relations in my notes. Can anyone explain them to me?
Like say I have a set A = {1, 2, 3} and R is a relation on A such that R = {(1, 2), (2, 3)}.
What is R^-1?
TheSonicRetard on
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An inverse relation is when you transpose x and y.
So I'm think thinking R^-1 = {(2,1), (3,2)}.
What class/grade are you in? I'm not sure that's all you need.
http://en.wikipedia.org/wiki/Inverse_relation
R is just a set of ordered pairs that relate to A. In that specific example, xRy such that x = y-1. I.e. we take set A, and look for ordered pairs where x and y exist such that x = y-1. I.e. (1, 2) and (2, 3).