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Jan
31
comment Example of operator with spectrum equal to $\mathbb{C}$?
You have examples for 2 & 3? If so, could you take a direct sum of those?
Jan
30
awarded  Necromancer
Jan
28
awarded  Nice Answer
Jan
27
awarded  Guru
Jan
23
comment Why does the Gram-Schmidt procedure divide by 0 on a linearly dependent lists of vectors?
@ihadanny: It is 0 because it is a vector in the span of the $e_i$s whose inner product with each $e_i$ is 0.
Jan
22
awarded  Good Answer
Jan
15
awarded  Nice Answer
Jan
6
awarded  Nice Answer
Jan
3
reviewed Close why don't standard analysis texts relax the injectivity requirement of the multivariable change of variables theorem?
Jan
3
comment $\lim_{x\to c} f(x)=l \implies f(x)$ is defined in a neighbourhood $c$?
It depends on context not given. Sometimes yes it would imply that by the definition.
Jan
3
reviewed Close $\left (1+\frac{a}{b} \right) \left(1+\frac{b}{c} \right) \left(1+\frac{c}{a} \right) \geq 2 \left ( 1+\frac{a+b+c}{\sqrt[3]{abc}} \right).$
Jan
3
reviewed Close Show that $cl(A) = int(A^c)^c$
Jan
3
answered Prove that $\{x_n\}$ is bounded if $f(x_n)$ is bounded $\forall f\in X'$
Jan
1
answered Are all Banach spaces also Hilbert spaces?
Dec
30
awarded  Nice Answer
Dec
17
awarded  Good Answer
Dec
11
awarded  Nice Answer
Dec
6
awarded  Good Answer
Nov
22
awarded  Enlightened
Nov
22
awarded  Nice Answer