Mathematics - Posts by Snoopy‭

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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 6mo ago by Snoopy‭ · last activity 6mo ago by Snoopy‭

Question multivariable-calculus derivatives

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Q&A If $\mathbf{R}$ is thought of as a vector space over $\mathbf{Q}$, what is its dimension?

1 answer · posted 7mo ago by Snoopy‭ · last activity 7mo ago by r~~‭

Question linear-algebra vector-space

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Q&A Proving that $p\mid (p+1776)$ if $p$ is a prime and $p(p+1776)$ is a perfect square

2 answers · posted 6mo ago by Snoopy‭ · last activity 6mo ago by Snoopy‭

Question number-theory algebra

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Q&A Proving that $p\mid (p+1776)$ if $p$ is a prime and $p(p+1776)$ is a perfect square

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

Answer

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Q&A How can 3/1 ≡ 1/(1/3), when left side features merely integers, but right side features a repetend?

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

Answer

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Q&A The gcd of powers in a gcd domain

0 answers · posted 8mo ago by Snoopy‭ · edited 8mo ago by Snoopy‭

Question abstract-algebra

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Q&A Given two angles of a triangle, finding an angle formed by a median

1 answer · posted 7mo ago by Snoopy‭ · last activity 4mo ago by Tim Pederick‭

Question euclidean-geometry vector

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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 4mo ago by Snoopy‭ · last activity 4mo ago by r~~‭

Question real-analysis limits

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Q&A Criterion in terms of the bases for determining whether one topology is finer than another

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

Question topology

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Q&A Example of $f:[0,1]\to\mathbf{R}$ with $\lim_{a\to 0^+}\int_a^1f(x)dx=L $ for some real number $L$ but $\int_0^1|f(x)|dx=\infty $

1 answer · posted 4mo ago by Snoopy‭ · last activity 4mo ago by r~~‭

Question real-analysis improper-integral

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Q&A What did James Stewart mean by "the line integral reduces to an ordinary single integral in this case" ?

posted 3mo ago by Snoopy‭ · edited 2mo ago by Snoopy‭

Answer

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Meta Extra "bar" in the post

1 answer · posted 3mo ago by Snoopy‭ · edited 2mo ago by Snoopy‭

Question discussion bug support

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Q&A Proving $|{\bf R}^{\bf R}|=|2^{\bf R}|$ using the Schroeder-Bernstein Theorem

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

Question set-theory

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Q&A Universal property of quotient spaces

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

Question topology

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Q&A Universal property of quotient spaces

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

Answer

Communities

Posts by Snoopy‭