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 Jan8 awarded Yearling Sep24 awarded Autobiographer Sep3 awarded Nice Question Jan9 revised Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$? added 8 characters in body Jan9 comment Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$? @Henry , there is a difference between this question and "related question". My question: Does it "equal" or "converge"?. Jan9 comment Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$? Explanation:"=" is a particular case of "$\to$". For example $x=a \implies x\to a$ but the converse is not always true. Jan9 comment Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$? "=" is a particular case of "$\to$". For example $x=a \implies x\to a$ but the converse not always true. Jan9 revised Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$? Explanation Jan9 asked Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$? Jan6 answered Evaluation of $\displaystyle \lim_{x \to 0} \frac{\sin ( \pi \cos(x) )}{x \sin x}$ using a Taylor Approximation Dec22 revised How find this minimum of the $k$ such $B\bigcup f(B)=X$ Correction Dec22 revised How find this minimum of the $k$ such $B\bigcup f(B)=X$ Add proof Dec22 answered How find this minimum of the $k$ such $B\bigcup f(B)=X$ Dec22 comment How find this minimum of the $k$ such $B\bigcup f(B)=X$ for any X the subset of A, do you mean A the subset of X? Dec22 comment What does $\frac{1}{n}$ converge to? This question is equivalent to "what is the exact value of $n$ as $n \to \inf$ ?" Dec21 answered How to solve this equation? $|x-5|=10$ Dec21 answered Questions about Divisibility of $2^n$ by $3$ Dec21 answered Let $x,y,z$ be integers and $11$ divides $7x+2y-5z$. Show that $11$ divides $3x-7y+12z$. Dec21 comment Use the addition or subtraction formula for cosine to compute $\cos(-5\pi/12)$ Hint: $cos(-5\pi /12)=cos(5\pi /12)$ Dec20 comment $\{x : P(x)\}$ vs. $\{P(x) : x\}$ -— When are these set-builder notations the same and different? ":" means "such that".