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Figurinha
  • Member for 6 years, 5 months
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  • Planet Earth
4 votes
1 answer
301 views

Why can't we define intersection with all the elements of a filter?

4 votes
1 answer
91 views

Proving $\sum_{s \in S} \frac{1}{n}$ converges for $S = \{ s \in \mathbb{N} : s$ has no zeros on its decimal representation $\}$

4 votes
1 answer
298 views

$X$ Hausdorff and Compact, $f: X \rightarrow X$ continuous. Is the set of fixed points of $f$ Compact?

3 votes
1 answer
3k views

Totally bounded set implies its closure is totally bounded

3 votes
1 answer
262 views

Proof of inner product property: $\langle Ax,x \rangle = \langle x,A^Tx \rangle$ [duplicate]

3 votes
2 answers
81 views

No polynomials of degree > 0 are such that $p(t)^2 + q(t)^2 =1$

2 votes
1 answer
316 views

if A is symmetric positive definite the method JOR (over-relaxation) converges for a condition over $\omega$

1 vote
2 answers
79 views

Convergence of a "rotating movement" in the Complex Plane

1 vote
1 answer
443 views

$A$ is a symmetric positive-definite matrix it has square root using SVD

1 vote
0 answers
95 views

If $A$ is a symmetric positive-definite matrix then $U = V$ in the SVD [duplicate]

1 vote
1 answer
147 views

In the LU decomposition with pivoting proof $L = PM^{-1}$ is unit lower triangular

0 votes
1 answer
186 views

Counter example of LU decomposition uniqueness

0 votes
1 answer
69 views

Proof that ellipse can't be represented by a parametric polynomial

0 votes
1 answer
49 views

The shape of the Rational Basis Functions and the Basis Functions for generating NURBS