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mandella
  • Member for 5 years, 8 months
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2 votes

Does sequence ${ s }_{ n }=\sum _{ k=0 }^{ n }{ \frac { 1 }{ { 1+k }^{ 2 } } } $ converge

2 votes

Repetitions allowed and not allowed

1 vote
Accepted

For ring homomorphism $\phi:R\to S$, prove that $\phi$ is an isomorphism iff $\phi$ is onto and $ker(\phi)=\left \{0_{R} \right \}$.

1 vote
Accepted

What does it mean for the columns of a matrix to be linearly independent?

1 vote

Group of order 35 must have a normal subgroup of order 5 or 7

1 vote

Number of password number-letter combinations given constraints

1 vote

Show that $d(x,y)= \left|\frac{1}{x} - \frac{1}{y}\right|$ defines a metric on $(0,\infty)$.

1 vote

Set theory general questions

1 vote

Determining if the binary operation gives a group structure

1 vote

Find the region for double integrals

1 vote
Accepted

$ \displaystyle \sum_{n=2}^{\infty} \frac{(-1)^n}{2n-1}$ convergence with alternating series test,absolute convergence

0 votes

If G is abelian and $n>1$ is an integer, then $A=\{a^n \mid a \in G\}$ is a subgroup of $G$.

0 votes
Accepted

Convergence at $\alpha$

0 votes

How to prove a graph and its transpose graph have the same SCC?

0 votes

How to find all the subgroups of $\mathbb{Z}_4$

0 votes

Show that the harmonic conjugates are collinear - Menelaus and Ceva's Theorems with homogeneous coordinates

0 votes

testing if a die is fair with hypothesis testing

0 votes
Accepted

If every block in graph G is eulerian, is G necessarily eulerian?