let A be a subset of R

prove that x is a lower bound of A if and only if -x is a lower bound of -A

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- Sep 17th 2009, 08:57 AMjmheaneylower bound
let A be a subset of R

prove that x is a lower bound of A if and only if -x is a lower bound of -A - Sep 17th 2009, 09:40 AMHallsofIvy
This is your third post in a row about basically the same thing. Have you

**tried**anything? What does "x is a lower bound of A"**mean**? If a is a member of A, what equation or inequality can you write?