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Posts by Snoopy‭

43 posts
Score Age
77%
+5 −0
Q&A Proving that $p\mid (p+1776)$ if $p$ is a prime and $p(p+1776)$ is a perfect square

posted 2y ago by Snoopy‭  ·  edited 2y ago by Snoopy‭

Answer
77%
+5 −0
Q&A Why can't we conclude the extrema property of a function from its quadratic approximation when the discriminant is zero?

1 answer  ·  posted 2y ago by Snoopy‭  ·  last activity 2y ago by Snoopy‭

Question multivariable-calculus derivatives
75%
+4 −0
Q&A If $\mathbf{R}$ is thought of as a vector space over $\mathbf{Q}$, what is its dimension?

1 answer  ·  posted 2y ago by Snoopy‭  ·  last activity 2y ago by r~~‭

Question linear-algebra vector-space
75%
+4 −0
Q&A Proving that $p\mid (p+1776)$ if $p$ is a prime and $p(p+1776)$ is a perfect square

2 answers  ·  posted 2y ago by Snoopy‭  ·  last activity 2y ago by Snoopy‭

Question number-theory algebra
75%
+4 −0
Q&A How can 3/1 ≡ 1/(1/3), when left side features merely integers, but right side features a repetend?

posted 2y ago by Snoopy‭  ·  edited 2y ago by Snoopy‭

Answer
71%
+3 −0
Q&A Using convexity in the proof of Hölder’s inequality

posted 1y ago by Snoopy‭  ·  edited 10mo ago by Snoopy‭

Answer
71%
+3 −0
Q&A Does the series $\sum_{n=1}^{\infty} \frac{n^n}{n!} e^{-n}$ converge?

posted 5mo ago by Snoopy‭  ·  edited 5mo ago by Snoopy‭

Answer
71%
+3 −0
Q&A Find the value of $\sum_{k=1}^\infty\frac{k^2}{k!}$

3 answers  ·  posted 6mo ago by Snoopy‭  ·  last activity 6mo ago by Derek Elkins‭

Question complex-analysis real-analysis series
71%
+3 −0
Q&A Fourier transform of an $L^1$ function is uniformly continuous

posted 12mo ago by Snoopy‭  ·  edited 12mo ago by Snoopy‭

Answer
71%
+3 −0
Q&A For any real number $m$, $ \left|\sum_{n=1}^{\infty}\frac{m}{n^2+m^2}\right|<\frac{\pi}{2} $

posted 1y ago by Snoopy‭  ·  edited 1y ago by Snoopy‭

Answer
71%
+3 −0
Q&A The gcd of powers in a gcd domain

0 answers  ·  posted 2y ago by Snoopy‭  ·  edited 2y ago by Snoopy‭

Question abstract-algebra
71%
+3 −0
Q&A Using convexity in the proof of Hölder’s inequality

1 answer  ·  posted 1y ago by Snoopy‭  ·  last activity 10mo ago by Snoopy‭

Question real-analysis
71%
+3 −0
Q&A If both $\lim_{x\to\infty}f(x)$ and $\lim_{x\to\infty}f'(x)$ exist, then $\lim_{x\to\infty}f'(x)=0$.

1 answer  ·  posted 1y ago by Snoopy‭  ·  last activity 1y ago by Snoopy‭

Question real-analysis
71%
+3 −0
Q&A $\liminf (a_n+b_n) = \liminf(a_n)+\liminf(b_n)$ provided that $\lim a_n$ exists

1 answer  ·  posted 1y ago by Snoopy‭  ·  last activity 6mo ago by Snoopy‭

Question real-analysis limits
71%
+3 −0
Q&A Criterion in terms of the bases for determining whether one topology is finer than another

1 answer  ·  posted 2y ago by Snoopy‭  ·  last activity 2y ago by celtschk‭

Question topology
71%
+3 −0
Q&A Finding the limit $ \lim_{x\to 0^+}e^{1/x}\sum_{n=\lfloor 1/x\rfloor}^\infty\frac{x^n}{n} $

1 answer  ·  posted 2y ago by Snoopy‭  ·  last activity 2y ago by r~~‭

Question real-analysis limits
71%
+3 −0
Q&A Given two angles of a triangle, finding an angle formed by a median

1 answer  ·  posted 2y ago by Snoopy‭  ·  last activity 2y ago by Tim Pederick‭

Question euclidean-geometry vector
66%
+2 −0
Q&A Fourier transform of an $L^1$ function is uniformly continuous

1 answer  ·  posted 12mo ago by Snoopy‭  ·  edited 12mo ago by Snoopy‭

Question real-analysis fourier-analysis
66%
+2 −0
Q&A Why does the method of separating variables work?

posted 7mo ago by Snoopy‭

Answer
66%
+2 −0
Q&A Find the value of $\sum_{k=1}^\infty\frac{k^2}{k!}$

posted 6mo ago by Snoopy‭

Answer
66%
+2 −0
Q&A Find the value of $\sum_{k=1}^\infty\frac{k^2}{k!}$

posted 6mo ago by Snoopy‭  ·  edited 6mo ago by Snoopy‭

Answer
66%
+2 −0
Q&A Does the series $\sum_{n=1}^{\infty} \frac{n^n}{n!} e^{-n}$ converge?

2 answers  ·  posted 5mo ago by Snoopy‭  ·  last activity 5mo ago by Snoopy‭

Question calculus real-analysis series
66%
+2 −0
Q&A Does the series $\sum_{n=1}^{\infty} \frac{n^n}{n!} e^{-n}$ converge?

posted 5mo ago by Snoopy‭  ·  edited 5mo ago by Snoopy‭

Answer
66%
+2 −0
Q&A Holomorphic function on a connected bounded open subset of the complex plane

1 answer  ·  posted 5mo ago by Snoopy‭  ·  last activity 5mo ago by Snoopy‭

Question complex-analysis
66%
+2 −0
Q&A Holomorphic function on a connected bounded open subset of the complex plane

posted 5mo ago by Snoopy‭  ·  edited 5mo ago by Snoopy‭

Answer