Thiago's user avatar
Thiago's user avatar
Thiago's user avatar
Thiago
  • Member for 11 years, 1 month
  • Last seen more than 1 year ago
9 votes
3 answers
18k views

Maclaurin Series of $\frac{1}{e^x -1}$

7 votes
1 answer
3k views

PDE - solution with power series

7 votes
4 answers
391 views

Showing a function $f: \mathbb{N} \times\mathbb{N} \to \mathbb{N}$ is injective

4 votes
1 answer
334 views

Proof that $\dim V = \dim \phi(V)+\dim \ker \phi$

3 votes
1 answer
657 views

Show $J_2(x) = (2/x)J_1(x)-J_0(x)$

3 votes
1 answer
3k views

Isometry is not surjective

3 votes
1 answer
449 views

Existence of fixed point

3 votes
2 answers
781 views

Field isomorphism of $\mathbb{C}$ onto itself

3 votes
1 answer
10k views

If x and y are arbitrary real numbers with x<y, prove that there are infinite real and rational numbers greater than x and smaller than y

3 votes
3 answers
5k views

Limit of $\lim_{(x,y)\rightarrow(0,0)}\frac{x^2y^2}{x^3+y^3}$

3 votes
2 answers
375 views

Finding the coefficient of a polynomial

2 votes
3 answers
1k views

Prove that this is no real number such that $x \leq a$ for all real $x$.

1 vote
1 answer
628 views

A real vector space with a complex structure is naturally a complex vector space

1 vote
2 answers
71 views

Multilinear maps: is $\phi(av_1,v_2)$ always equal to $\phi(v_1,av_2)$?

1 vote
2 answers
53 views

Convergence of $\sum_{n=0}^{\infty}ne^{-\beta n}$ [duplicate]

1 vote
1 answer
54 views

Metric space and closed sets (book misprint?)

1 vote
1 answer
2k views

Hermitian transformation

0 votes
1 answer
182 views

Solving the heat equation - derivative of an integral

0 votes
1 answer
975 views

$A=(A \cap B) \cup(A \cap B^\mathsf{c}) $

0 votes
1 answer
160 views

Solution of a PDE - method of characteristics

0 votes
1 answer
119 views

Vector Laplacian in Curved Spaces