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Let RR be the set of real numbers and x,...

Let `RR` be the set of real numbers and `x,yinR`. We define operaitons `^^andvv` on `RR` as
`x^^y=` maximum of x and y,
`xvvy=` minimum of x and y.
Show the operation `^^` and `vv` defined above are binary operations on `RR`.

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