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Hagrid
  • Member for 11 years, 5 months
  • Last seen more than 5 years ago
27 votes
3 answers
5k views

Riemann rearrangement theorem

21 votes
1 answer
2k views

Inverse of a bijection f is equal to its derivative

11 votes
2 answers
3k views

Barycentric coordinates in a triangle - proof

9 votes
2 answers
10k views

Prove that if a continuous function is injective, then it is monotonic

9 votes
2 answers
5k views

Number of $n$-digit palindromes

7 votes
1 answer
804 views

Graph, two colors, no path length 3

7 votes
1 answer
349 views

What functions satisfy $\sum _{n=1} ^{\infty} x_n < \infty \ \Rightarrow \sum _{n=1} ^{\infty} f(x_n) < \infty $ [duplicate]

6 votes
1 answer
2k views

Prove that any function can be represented as a sum of two injections

6 votes
3 answers
2k views

Classification of Euclidean plane isometries

6 votes
4 answers
563 views

Evaluating $\lim _{n \rightarrow \infty} (2n+1) \int_0 ^{1} x^n e^x dx$

6 votes
2 answers
2k views

Jordan block in a matrix with a complex eigenvalue

6 votes
2 answers
3k views

Sum of discrete and continuous random variables with uniform distribution

6 votes
1 answer
2k views

Implicit function, not obvious version

6 votes
1 answer
535 views

Biholomorphic map from a disk to its quarter

5 votes
2 answers
483 views

Normed separable space, linearly independent $X_0 \subset X, \ \overline{linX_0} = X $

5 votes
0 answers
596 views

Analytic variety is a countable union of complex manifolds

5 votes
0 answers
271 views

Sigma algebra generated by a homeomorphic random variable

5 votes
1 answer
311 views

Definite integral, floor function, parameter

5 votes
2 answers
311 views

Berkeley exam summer '79, sequence of continuous functions, integral, convergence

5 votes
1 answer
360 views

$f_n(x_n)\to f(x) $ implies $f$ continuous - a question about the proof

5 votes
0 answers
78 views

Functional sequence [duplicate]

5 votes
1 answer
142 views

Extension of a binary operation

5 votes
1 answer
1k views

Stirling numbers, binomial coefficients

4 votes
5 answers
635 views

$n\times n$ board, non-challenging rooks

4 votes
2 answers
225 views

$\lim \frac{a_{2n}}{a_n}< \frac{1}{2}$ series convergent

4 votes
1 answer
183 views

Polynomial expression of $\frac{\sin x}{x} $

4 votes
2 answers
3k views

Connected graph, each power of adjacency matrix has zeros

4 votes
1 answer
2k views

Lower limit topology regular space $ T_3$

4 votes
1 answer
259 views

Algebra book recommendation inverse limit, universal property

4 votes
1 answer
321 views

Question about a solution to a problem involving Taylor's theorem and local minimum