Christian Ivicevic
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 Nov14 suggested approved edit on LaTeX help - multiple answers using set bracket / cases Nov14 answered LaTeX help - multiple answers using set bracket / cases Nov13 comment Is there a subset of a non regular language that is regular @user34790: Every finite language is regular because you can create a enumerate all elements extensionally. Furthermore there exists a regular expression of the form "word1 | word2 | ... | wordN" which implies the regularity of all finite languages. Nov13 comment Is there a subset of a non regular language that is regular I can provide a cheat sheet from my "Theoretical Computer Science" course (in German). Just have a look at the top picture with all the boxes. From top to bottom (on thr right hand side) the descriptions are: all languages $\Sigma^*$, semi-decidable (Type 0), decidable, LOOP-decidable, NP, P, context free (Type 2), regular (Type 3), finite. Hope this might help :) Nov13 revised Is this language and its complement is Context free Language? added 69 characters in body Nov13 comment Is this language and its complement is Context free Language? @Sudhir: Please have a look at my updated answer, I did a mistake before! Nov13 revised Is this language and its complement is Context free Language? corrected false assumption Nov13 revised Suppose that $f: \mathbb R^q \to \mathbb R^p$ is a linear map. Prove that $f$ is differentiable and that $f'(x) = f$ for every $x \in \mathbb R^q$ added latex commands Nov13 suggested approved edit on Suppose that $f: \mathbb R^q \to \mathbb R^p$ is a linear map. Prove that $f$ is differentiable and that $f'(x) = f$ for every $x \in \mathbb R^q$ Nov13 revised Is this language and its complement is Context free Language? added latex commands Nov13 suggested approved edit on Is this language and its complement is Context free Language? Nov13 answered Is this language and its complement is Context free Language? Nov12 revised The set of words in {a,b,c}∗ that do not contain the substring bc. added picture to show DFA Nov12 answered The set of words in {a,b,c}∗ that do not contain the substring bc. Nov12 accepted $\lim\limits_{x\to\infty}\frac{(x+7)^2\sqrt{x+2}}{7x^2\sqrt{x}-2x\sqrt{x}}$ Nov12 comment $\lim\limits_{x\to\infty}\frac{(x+7)^2\sqrt{x+2}}{7x^2\sqrt{x}-2x\sqrt{x}}$ I did replace it with $\sqrt{x^2+2x+1}=\sqrt{(x+1)^2}=(x+1)$ thinking of sufficiently large $x$. Nov12 comment $\lim\limits_{x\to\infty}\frac{(x+7)^2\sqrt{x+2}}{7x^2\sqrt{x}-2x\sqrt{x}}$ @icurays1: I think I need a break... fixed this one, too. Nov12 revised $\lim\limits_{x\to\infty}\frac{(x+7)^2\sqrt{x+2}}{7x^2\sqrt{x}-2x\sqrt{x}}$ edited body Nov12 comment $\lim\limits_{x\to\infty}\frac{(x+7)^2\sqrt{x+2}}{7x^2\sqrt{x}-2x\sqrt{x}}$ @icurays1: That was just a typo, thanks for reminding me of that! Nov12 revised $\lim\limits_{x\to\infty}\frac{(x+7)^2\sqrt{x+2}}{7x^2\sqrt{x}-2x\sqrt{x}}$ edited body