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A.S's user avatar
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A.S
  • Member for 12 years, 2 months
  • Last seen more than 3 years ago
  • United States
40 votes
2 answers
12k views

Is there a monotonic function discontinuous over some dense set?

26 votes
7 answers
9k views

Uncountable closed set of irrational numbers

16 votes
3 answers
393 views

$\sum_i x_i^n = 0$ for all $n$ implies $x_i = 0$

15 votes
1 answer
632 views

Fibonacci Sequence in $\mathbb Z_n$.

12 votes
4 answers
18k views

Hitting probability of biased random walk on the integer line

11 votes
1 answer
1k views

Why is $H^*(\mathbb{CP}^\infty, \mathbb{Z})$ not $\mathbb{Z}[[x]]$?

8 votes
1 answer
662 views

Baby Rudin Problem 2.17: Homeomorphism to a Cantor Set?

5 votes
2 answers
5k views

Proof that Gauss-Jordan elimination works

5 votes
3 answers
3k views

Dirichlet Function Pointwise Convergence

5 votes
2 answers
1k views

Injective function $f : \mathbb R \to \mathbb R$ that is dense in $\mathbb R^2$

4 votes
1 answer
271 views

Measures on all subsets of $\aleph_0$

4 votes
1 answer
486 views

Can we prove $\displaystyle \limsup_{n \to \infty} \sin(n) = 1$?

3 votes
1 answer
498 views

Are the constant functions a closed subspace in the polynomials?

3 votes
0 answers
366 views

Sequences of Natural Numbers without Arithmetic Subsequences

3 votes
0 answers
140 views

Can Oka's coherence theorem be made (partially) constructive / algorithmic?

2 votes
1 answer
51 views

Estimating the number of books in the world from randomly chosen overlapping lists

2 votes
2 answers
486 views

Dirichlet's Test Remark in Apostol

2 votes
3 answers
115 views

Question on sequences

2 votes
1 answer
280 views

Expected number of edges: does $\sum\limits_{k=1}^m k \binom{m}{k} p^k (1-p)^{m-k} = mp$

2 votes
2 answers
174 views

Subgroup of motions without a translation?

2 votes
2 answers
488 views

Prove second derivative of $g$ is proportional to $g^2$

1 vote
1 answer
56 views

Proving partial sums $A_n = o(|z_k|^\rho)$, where $|z_k|\to\infty$ is increasing

0 votes
0 answers
93 views

Conditional probability and a normal distribution

0 votes
1 answer
943 views

Prove Axiom $10$ (Vector Spaces) independent of the others [duplicate]

0 votes
1 answer
164 views

For which values of $t$ is $t T + (1-t) I$ Fredholm, where $T$ is the left shift?