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Mathematics Teacher


Sep
24
awarded  Autobiographer
Sep
3
awarded  Nice Question
Jan
9
revised Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$?
added 8 characters in body
Jan
9
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"?.
Jan
9
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.
Jan
9
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.
Jan
9
revised Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$?
Explanation
Jan
9
asked Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$?
Jan
6
answered Evaluation of $ \displaystyle \lim_{x \to 0} \frac{\sin ( \pi \cos(x) )}{x \sin x}$ using a Taylor Approximation
Dec
22
revised How find this minimum of the $k$ such $B\bigcup f(B)=X$
Correction
Dec
22
revised How find this minimum of the $k$ such $B\bigcup f(B)=X$
Add proof
Dec
22
answered How find this minimum of the $k$ such $B\bigcup f(B)=X$
Dec
22
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?
Dec
22
comment What does $\frac{1}{n}$ converge to?
This question is equivalent to "what is the exact value of $n$ as $n \to \inf$ ?"
Dec
21
answered How to solve this equation? $|x-5|=10$
Dec
21
answered Questions about Divisibility of $2^n$ by $3$
Dec
21
answered Let $x,y,z$ be integers and $11$ divides $7x+2y-5z$. Show that $11$ divides $3x-7y+12z$.
Dec
21
comment Use the addition or subtraction formula for cosine to compute $\cos(-5\pi/12)$
Hint: $ cos(-5\pi /12)=cos(5\pi /12) $
Dec
20
comment $ \{x : P(x)\} $ vs. $ \{P(x) : x\} $ -— When are these set-builder notations the same and different?
":" means "such that".
Dec
20
comment Evaluating the definite integral $\int^{\pi/2}_0 \frac{x+\sin x}{1+\cos x}\,\mathrm dx$
Hint: $\int \,\frac{\sin x}{1+\cos x} dx= -ln(|1+cosx|)+ C$