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The best Integer duty is defined as
$$\lfloor x \rfloor = \mboxthe biggest integer the is$$ less than or equal to $$x$$.
In mathematics notation we would certainly write this as
$$ \lfloor x\rfloor = \max\m\in\mathbbZ $$
The notation "$$m\in\mathbbZ$$" means "$$m$$ is one integer".
If we study a number line with the integers and also 2.7 plotted top top it, we see
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How to use the pythagorean Theorem
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