Federica Maggioni's user avatar
Federica Maggioni's user avatar
Federica Maggioni's user avatar
Federica Maggioni
  • Member for 11 years, 5 months
  • Last seen more than 3 years ago
  • Bergamo, Italy
74 votes

Why is $\frac{987654321}{123456789} = 8.0000000729?!$

27 votes

How to prove the fraction identity without using calculator

18 votes
Accepted

Rotating x,y points 45 degrees

18 votes
Accepted

An infinite union of closed sets is a closed set?

14 votes
Accepted

Frattini subgroup is set of nongenerators

13 votes
Accepted

If $ G $ has no non-trivial automorphism, then $ G $ is abelian and $ g^2 = e $ for all $ g \in G $ .

10 votes

Revisted: GCD - $(a,c)=1=(b,c) \overset{?}{\implies} (ab,c)$

10 votes
Accepted

sufficiency and necessity of convergence of $\sum a_n$ wrt convergence of $\prod (1 + a_n)$

9 votes

How to find a Laurent Series for this function

6 votes

Normal subgroup of a normal subgroup

6 votes

Explain Why $\int\frac{f'(x)}{f(x)}\,\mathrm dx = \ln|f(x)|+C$

5 votes

How can I prove that a set of real numbers always have a minimum?

5 votes

Proving that $\langle{M}\rangle$ is a subgroup of $G$

5 votes
Accepted

Normal subgroups and cosets

5 votes
Accepted

Can somebody provide an explanation to the formula of a one elementary integral?

5 votes

$\operatorname{rank}(A + B) ≤ \operatorname{rank}(A) + \operatorname{rank}(B)$

5 votes
Accepted

Calculate the residue of $\frac{e^{2z}}{(e^{iz} +1)}$?

4 votes

Solve equation $\sqrt{s+13} - \sqrt{7-s} = 2$

4 votes

Limit Points Explanation required

4 votes
Accepted

Order of $\frac{f}{g}$

4 votes

Prove that a bounded analytic function in the right half-plane which vanishes at each positive integer is identically zero.

4 votes
Accepted

Maximum modulus principle exercise.

4 votes
Accepted

Proof of complement of intersection defined using an arbitrary set.

4 votes
Accepted

Finding Residue Classes

4 votes
Accepted

$\mathbb{Z}[\sqrt{-23}]$: A uniquely written set?

4 votes

Proof: $\vec x,\vec y \perp \vec z \Rightarrow \vec x || \vec y$

4 votes

Finding the points of disctontinuity of greatest integer function

4 votes
Accepted

If $H,K \leq G$ a finite group, then $\left\lvert HK \right\rvert = \cdots$

4 votes

Composition of Continous function is continuous

3 votes

$g \circ f$ trivial implies that $Im f \subseteq ker g$