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 Oct 19 comment Using Pumping Lemma to show a language is not regular This is correct, you could probably be a little more concise on the ending. Just say that the fact that $xyyz$ is not in the language means the language does not satisfy the pumping lemma. So our assumption that the language is regular must be incorrect. It also couldn't hurt to write out $xyyz$ to be more explicit, that is, $xyyz = 0^{p+k}1^p 1^p$ for some $k \geq 1$, noting that $2(p+k) > 2p$. Apr 30 answered When to use the $\equiv$ symbol (such as in $5^{6}$ $\equiv$ 1 mod 7) vs = Apr 25 awarded Popular Question Dec 15 answered To which group is $G/\ker \phi$ isomorphic to? Nov 30 awarded Custodian Nov 30 reviewed Approve Meaning of the word “conjugate” across mathematics? Nov 30 asked Meaning of the word “conjugate” across mathematics? Nov 24 accepted Solutions of $a^{2} - 2b^{2} \equiv 0$ mod $p$ Nov 24 comment Solutions of $a^{2} - 2b^{2} \equiv 0$ mod $p$ Thank you very much! The terminology really helps when researching this! Nov 24 asked Solutions of $a^{2} - 2b^{2} \equiv 0$ mod $p$ Jul 2 awarded Curious Jun 29 awarded Enthusiast Jun 19 awarded Organizer Jun 19 revised Real-analytic $f(z)=f(\sqrt z) + f(-\sqrt z)$? add analysis tag Jun 19 revised Real-analytic periodic $f(z)$ that has more than 50 % of the derivatives positive? add analysis tag Jun 19 suggested approved edit on Real-analytic periodic $f(z)$ that has more than 50 % of the derivatives positive? Jun 19 suggested approved edit on Real-analytic $f(z)=f(\sqrt z) + f(-\sqrt z)$? Jun 7 revised What is the relationship between the area of a triangle and an area of a segment of a circle? added detail Jun 7 awarded Teacher Jun 7 answered What is the relationship between the area of a triangle and an area of a segment of a circle?