Well, I know the definition of semi-algebra but I cannot prove that all intervals contained in [0,1] is a semi-algebra
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What have you tried? Where are you stuck? – Robert Shore Mar 06 '19 at 18:38
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Hi. Do you know the answer? Thanks. – antonis34 Mar 08 '19 at 14:43
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Many of us probably do. But we're not here to feed people homework answers. That's why we want to see evidence that you've tried in good faith to solve the problem before coming here. – Robert Shore Mar 08 '19 at 16:36