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Jun
11
revised Find limit of the quotient
added 175 characters in body; edited title
Jun
10
answered Find $\lim\limits_{x\to \infty} \frac{x\sin x}{1+x^2}$
Jun
10
revised Connection between $\epsilon-\delta$ definition of limit and Weierstrass definition of continuous functions
added 1 character in body
Jun
10
comment What's wrong with this?
@Thomas i suppose he is trying to argue that $e^x = 1$ implies $x=0$, which is obviously problematic in complex arithmetic. Not sure what he needs the logs for.
Jun
10
comment Prove $\lim\limits_{n\to\infty}\frac{1}{\sqrt[n]{n!}}=0$
it is right, not sure of other approaches
Jun
10
revised Prove $\lim\limits_{n\to\infty}\frac{1}{\sqrt[n]{n!}}=0$
LaTeX error in title and typsetting $\ln$
Jun
10
answered $e^{X_t - \frac{t^3}{6}}$ is a martingale - show it
Jun
10
comment $e^{X_t - \frac{t^3}{6}}$ is a martingale - show it
what is the SDE for $X_t$?
Jun
10
comment Using Union to prove a context-free language?
@sci1991 yes, that is the usual way
Jun
10
answered Using Union to prove a context-free language?
Jun
10
comment Stable matching solutions
please clarify your question
Jun
10
comment Using Union to prove a context-free language?
I agree that $L_1 \cup L_2 = L_2$, which happens because $L_1 \subset L_2$. Both are CFL -- but what new information does this give you? What are you trying to conclude that you don't know before your union argument?
Jun
10
comment Finding the number of primes numbers using exclusion/inclusion principle: What am I doing wrong?
can you elaborate on the basis of what you are using incl/excl? # of divisors?
Jun
10
comment Finding the number of primes numbers using exclusion/inclusion principle: What am I doing wrong?
are you possibly counting 1 in one place and not the other?
Jun
10
comment A difficult integral about function $\ln x$ and $\ln\ln x$
perhaps decompose $ln(1+x)$ into McLaurin series and integrate within radius of convergence?
Jun
9
revised Proof check: if for any two vertices the degree sum is $n-1$ then $G$ is connected
edited title
Jun
9
comment When does $(x^x)^x=x^{(x^x)}$ in Real numbers?
@GEdgar fixed it thanks
Jun
9
revised When does $(x^x)^x=x^{(x^x)}$ in Real numbers?
deleted 90 characters in body
Jun
9
answered When does $(x^x)^x=x^{(x^x)}$ in Real numbers?
Jun
9
revised When does $(x^x)^x=x^{(x^x)}$ in Real numbers?
added 2 characters in body