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Anne Bauval's user avatar
Anne Bauval's user avatar
Anne Bauval's user avatar
Anne Bauval
  • Member for 7 years, 7 months
  • Last seen this week
  • Université-Paul-Sabatier, Toulouse, France
27 votes
Accepted

How to calculate infinite limit for function and its derivative?

18 votes
Accepted

Suppose $a$ and $b$ belong to a ring. If $ab$ is a zero divisor, then is $ba$ also a zero divisor?

16 votes
Accepted

Equating determinants using properties

16 votes

Does a homeomorphism preserve the open sets?

15 votes
Accepted

How to prove that these subspaces of $\Bbb R^3$ are pairwise non-homeomorphic?

15 votes

Please explain how to solve limit. I know the answer but how to explain it?

14 votes
Accepted

About an integral of the MIT Integration Bee Finals (2023)

14 votes

The sum of the series by derivatives

14 votes
Accepted

Is this set of natural sequences countable?

13 votes

Simplifying $\frac{\sin(3x)+\sin(4x)+\sin(5x)}{\sin(x)+\sin(2x)+\sin(3x)}$

13 votes
Accepted

Give an example of a function $h:\mathbb{R}\backslash\mathbb{Q}\rightarrow\ \mathbb{Q}$

10 votes
Accepted

Solving ${255\choose 128} \mod 257$

10 votes

Prove that a Banach space cannot be reflexive if some strict closed subspace of its dual space separates its points

9 votes

Why does Gaussian elimination sometimes work in rings where it should not?

8 votes
Accepted

Prove that this expression is equal to $\pi$

8 votes

Find the limit of $a_n$ = $(n+\sqrt n)^\frac{1}{4} - n^\frac{1}{4}$.

8 votes

Characterization of distance between points in separable space

8 votes
Accepted

Maximizing $(x-y)^2(y-z)^2(z-x)^2$ where $x^2+y^2+z^2=1$

8 votes
Accepted

Prove that number $(4n-1)(2n-1)(2n+1)(4n+1)$ is not a perfect square.

7 votes

Solving a limit by the Squeeze theorem

7 votes
Accepted

Prove that $\langle a,b\mid ab=ba^n\rangle$ is not isomorphic to $\langle a,b\mid ab=ba^{n'}\rangle$ when $n\neq n'$

7 votes
Accepted

Prove that $x^{2020} + x^{1011} + 2 x^{1010} + x^2 + x + 1$ does not have a real root

7 votes
Accepted

Essential supremum is actually a minimum

7 votes
Accepted

For three vectors in any inner product space, prove the following inequality.

7 votes
Accepted

Show that $f(x) = x^3 - 6x$ has no minimum on $[0,2]_{\mathbb{Q}}$.

7 votes
Accepted

A Combinatoric Identity Involving Binomial Coefficients: $\sum^{n}_{r=1} {n \choose r} (-1)^r \frac{2^r-1}{2r}= \sum^{n}_{r=1}\frac{(-1)^r}{2r}$

7 votes
Accepted

How to find the double integral of an absolute value trig function?

7 votes
Accepted

Closed form of the recursion $D_{n+1} = n(D_n + D_{n-1})$

7 votes

Minimum of $\frac{x^3}{x-6}$ for $x>6$ without using derivative?

7 votes

Why is $\int_0^\infty(\frac{1}{1+x^a}-\frac{1}{1+x^b})\frac{dx}{x}=0$ for all a,b>0?

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