Post Closed as "exact duplicate" by Alex Becker, draks ..., TMM, Martin Sleziak, Davide Giraudo of
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This post does not meet our quality standards.

I try to post question but I always get the message: This post does not meet our quality standards.

For example: I try to understand why by definition

$[c0,c1,...cn]=[c0,[c1,...cn]]$ and also
$[c0,c1,...cn]=[c0,c1,...c(n-2),[c(n-1),cn]]$ .

But not $[c0,c1,...cn]=[c0,c1,[c2,...cn]]$ for example.

or this:

P is a prime such that $q=p+2$ is also a prime.
I need to prove that there is an integer a such that $p|a^2-q$ if and only if there is b such that $q|b^2-p$.