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May 1, 2018 at 11:00 comment added Henrik Schumacher +1 for bringing up RealAbs. I didn't know that and I was positively surprised that RealAbs' evaluates to somethin reasonable (although I am a bit disappointed by `RealAbs'').
Mar 26, 2018 at 14:11 comment added xzczd @kittygirl A preciser statement is "y is an expression that evaluates to a real number for any desirable x" of course.
Mar 26, 2018 at 13:56 comment added kittygirl y should be expression, not a number
Mar 26, 2018 at 13:50 history answered xzczd CC BY-SA 3.0