negative e
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A= {x/x is a counting number less than 6} A={1,2,3,4,5} B={x/x is counting number than 5 but less than or equal to 10} B={6,7,8,9,10} -Mina Bacalla-
6+b Should it not be: b>6
I believe that's usually treated as an axiom, meaning you don't prove it.
It's the "less than" sign [ < ] above the "equals" sign [ = ].≤When you see it, you read it " ... less than or equal to ... ". That's the same as " ... no more than ... "
x >_ b means x is bigger than b or equal to b. x <_ b means x is smaller than b or equal to b. sorry for this stupid characters ;)