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frosh
  • Member for 9 years, 4 months
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3 votes
0 answers
2k views

Set of integers bounded above

3 votes
2 answers
1k views

If $\sum a_n$ is convergent and $a_n>0$, then $\sum (-1)^n a_n$ is convergent.

2 votes
1 answer
1k views

Sum of the series $\sum_{n=0}^{\infty} \frac{1}{4^n(2n+1)}$ [duplicate]

2 votes
3 answers
2k views

Distance between two skew lines.

2 votes
2 answers
463 views

Precise definition of limit

2 votes
4 answers
2k views

Proof of Cauchy-Schwarz Inequality

2 votes
0 answers
241 views

Case of equality in Bernoulli's inequality

2 votes
2 answers
45 views

Proving an inequality by induction.

2 votes
0 answers
223 views

Is the following proof of division algorithm correct?

2 votes
1 answer
1k views

Proving that an equation has a solution

2 votes
5 answers
5k views

Is the sequence $0,1,0,0,1,0,0,0,1,0,0,0,0,1,\ldots$ convergent? [closed]

2 votes
2 answers
126 views

$\sum_{n=1}^\infty \sqrt[3]{n^2+4}\cdot[\ln(n^2+2)-\ln(n^2+1)]$, convergent or divergent?

1 vote
2 answers
105 views

When $|z_1+\ldots + z_n| = |z_1| + \ldots + |z_n|$.

1 vote
1 answer
90 views

Proof of inequalities

1 vote
1 answer
114 views

Proving the existence of a supremum

1 vote
1 answer
220 views

Proof of a theorem about limits

1 vote
3 answers
994 views

Proof of there is no limit at $x=0$ for $f(x)=\sin(\frac{1}{x})$

1 vote
3 answers
785 views

How to prove that this function is integrable on $[0,1]$

0 votes
1 answer
55 views

Explanation about a problem

0 votes
1 answer
620 views

Limit of a function with two variables.

0 votes
1 answer
1k views

Recommendation about studying calculus.

0 votes
3 answers
111 views

A question about polynomials [duplicate]