PLAIN, AIRPLANE, SPAIN, PLANE, PLANET, PLUTO

PLANT, SUPPLANT, SUPPLIER, SUPPLE

APPLE, TOPPLE

SIMPLE, SIMPLER, SAMPLE, SAMPLER, AMPLE

PIMPLE

← 5 messages moved from Cafe and Tavern on the math.se

@user21820 I do know PL

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I am trying to learn FOL

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I did not get confused I was only left deeply disturbed all the time they were using the notions of sets functions etc if I took those for granted I understood it all

since there is no $x\in\mathbb{Q}$ so that $x^2=2$, but for any $\epsilon\gt0$, we can find an $x\in\mathbb{Q}$ so that $|x^2-2|\lt\epsilon$

so $\{x\in\mathbb{Q}:x^2\gt2\}$ is bounded below, but does not have an infimum. So it is not complete

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← 1 message moved from Room for Yuvraj and robjohn

← 1 message moved from Room for Yuvraj and robjohn

← 1 message moved from Room for Yuvraj and robjohn

at least tell me what I have to do not be moved to trash

*to not be

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