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seen Jun 12 at 22:40

Jul
2
awarded  Curious
May
23
asked How do I work out the last sentence in this section of a proof of the Unique Factorization Theorem?
Mar
19
asked How can I show that $u=e^{\sigma\sqrt{\Delta t}}$ in the binomial option pricing model
Dec
20
comment Please show $|\sin(n+1)x| = |\sin(nx+x)|$
Thanks. That makes sense. Is this typically how arguments for sine are written? I feel like the way you have written in in your answer makes much more sense, in fact, aren't the extra set of brackets necessary? Otherwise what I wrote in my question should be interpreted as (sin(n+1))*x, right?
Dec
20
accepted Please show $|\sin(n+1)x| = |\sin(nx+x)|$
Dec
19
asked Please show $|\sin(n+1)x| = |\sin(nx+x)|$
Oct
30
accepted What's the derivative $\frac{dE[F]}{dF_i}$ of this function $E[F] = |\frac{dF}{dx}|^2$?
Oct
21
asked What's the derivative $\frac{dE[F]}{dF_i}$ of this function $E[F] = |\frac{dF}{dx}|^2$?
Jun
12
accepted Evaluate the limit: $\lim_{(x,y,z)\to(0,0,0)}\frac{xy+yz^2+xz^2}{x^2+y^2+z^4}$
Jun
12
asked Evaluate the limit: $\lim_{(x,y,z)\to(0,0,0)}\frac{xy+yz^2+xz^2}{x^2+y^2+z^4}$
Jun
11
asked Why does direct substitution work for limits?
Jun
11
awarded  Commentator
Jun
10
comment How to evaluate $ \lim_{(x,y)\to(0,0)}\frac{y^2\sin^2x}{x^4+y^4} $
Thank you, Peter!
Jun
10
accepted How to evaluate $ \lim_{(x,y)\to(0,0)}\frac{y^2\sin^2x}{x^4+y^4} $
Jun
10
asked Limit of two variables, proposed solution check
Jun
10
comment How to evaluate $ \lim_{(x,y)\to(0,0)}\frac{y^2\sin^2x}{x^4+y^4} $
Thanks, Robert. That makes sense. So to my earlier point, is it sufficient to say that since the limit depends on the value of alpha, the limit cannot exist?
Jun
10
comment How to evaluate $ \lim_{(x,y)\to(0,0)}\frac{y^2\sin^2x}{x^4+y^4} $
Ok, I did that. I notice that the limit is dependent on the value of alpha which means the limit does not exist. Is this sufficient? Once I state this, what is the point of using sin(x)/x -> 1?
Jun
10
asked How to evaluate $ \lim_{(x,y)\to(0,0)}\frac{y^2\sin^2x}{x^4+y^4} $
May
26
accepted Find cumulative, marginal densities, moments for $f(x)=2,\le y \le x \le 1$ (multivariate)
May
26
comment Find cumulative, marginal densities, moments for $f(x)=2,\le y \le x \le 1$ (multivariate)
I really appreciate you taking the time to answer as thoroughly as you did. Thanks for the help! I think that should be enough to get me started on my own for now.