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Diego Silvera

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20 Questions

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answers

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Induction - Examples where the induction step is correct but the base case is always wrong [duplicate]

Mar 10 '15 at 4:31 Daniel W. Farlow 18k

votes

answer

181

views

The group $\mathbb{Z}^\mathbb{N}/\mathbb{Z}^{(\mathbb{N})}$ can't be embedded in a product $\mathbb{Z}^A$ for any $A$

abstract-algebra general-topology group-theory

Jun 3 '13 at 17:29 Diego Silvera 1,208

votes

answer

views

Linear isometry between $c_0$ and $c$

functional-analysis banach-spaces norm

Apr 28 '13 at 17:09 Diego Silvera 1,208

votes

answers

259

views

Every curve in $\mathbb{A}^3$ is the zero-locus of $3$ polynomials

algebraic-geometry algebraic-curves

Feb 25 '13 at 9:45 Community♦ 1

votes

answers

252

views

'Continued roots'' [duplicate]

calculus nested-radicals

Nov 29 '13 at 7:57 Community♦ 1

votes

answers

135

views

If $\operatorname{rk}(A) = 1$, when $B + A$ is invertible?

linear-algebra matrices

Apr 28 '13 at 6:10 Ma Ming 6,596

votes

answer

217

views

Questions about operator norm

functional-analysis

Dec 28 '12 at 5:43 Robert Israel 339k

votes

answer

583

views

Extension of sheaves

sheaf-theory

Nov 18 '12 at 17:22 Rankeya 6,350

votes

answers

views

Can $\mathbb{R}$ be obtained as union of disjoint translations of a dense subset?

general-topology

Jun 22 '13 at 2:47 Mariano Suárez-Álvarez 113k

votes

answers

views

Partial derivatives with respect to algebraically independent polynomials

algebraic-geometry commutative-algebra invariant-theory

Apr 16 '15 at 10:00 Diego Silvera 1,208

votes

answer

174

views

Questions about Milne book

algebraic-geometry

Feb 18 '13 at 1:00 Brenin 9,168

votes

answer

140

views

Maximal solutions of $x' = t^2 + x^2$

ordinary-differential-equations

Jan 23 '13 at 23:34 Community♦ 1

votes

answer

197

views

Closure of the curve $C = \{(x,y): y = e^x, x \in \mathbb{C}\}$ in the Zariski topology

algebraic-geometry

Dec 19 '12 at 20:57 Zev Chonoles 111k

vote

answer

views

Simulate random vector with given density

probability density-function

Oct 4 '17 at 15:07 Nadiels 2,410

vote

answer

views

Surjectivity of $\pi^{**}$

functional-analysis banach-spaces

Feb 12 '14 at 19:19 Daniel Fischer 175k

vote

answer

147

views

Meaning of linearization of an action

algebraic-groups

Jan 9 '13 at 20:50 Michael Joyce 12.5k

vote

answers

140

views

Linear automorphisms of $y^3 + y^6 = x^6$

algebraic-geometry

Dec 20 '12 at 4:29 Michael Hardy 1

vote

answer

103

views

Criterion for direct limits

category-theory

Dec 10 '12 at 10:54 Diego Silvera 1,208

votes

answers

views

Formal definition of: “The event $A$ is determinated by $X_0, \ldots, X_T$”

markov-chains

Jan 22 '17 at 16:46 Diego Silvera 1,208

votes

answer

views

For sets of reals $A$ and $B$, is it true that $(A + B)' = (\overline{A} + B') \cup (A' + \overline{B})$?

real-analysis general-topology

Sep 23 '15 at 4:23 Alex Ravsky 46.8k

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20 Questions

Induction - Examples where the induction step is correct but the base case is always wrong [duplicate]

The group $\mathbb{Z}^\mathbb{N}/\mathbb{Z}^{(\mathbb{N})}$ can't be embedded in a product $\mathbb{Z}^A$ for any $A$

Linear isometry between $c_0$ and $c$

Every curve in $\mathbb{A}^3$ is the zero-locus of $3$ polynomials

'Continued roots'' [duplicate]

If $\operatorname{rk}(A) = 1$, when $B + A$ is invertible?

Questions about operator norm

Extension of sheaves

Can $\mathbb{R}$ be obtained as union of disjoint translations of a dense subset?

Partial derivatives with respect to algebraically independent polynomials

Questions about Milne book

Maximal solutions of $x' = t^2 + x^2$

Closure of the curve $C = \{(x,y): y = e^x, x \in \mathbb{C}\}$ in the Zariski topology

Simulate random vector with given density

Surjectivity of $\pi^{**}$

Meaning of linearization of an action

Linear automorphisms of $y^3 + y^6 = x^6$

Criterion for direct limits

Formal definition of: “The event $A$ is determinated by $X_0, \ldots, X_T$”

For sets of reals $A$ and $B$, is it true that $(A + B)' = (\overline{A} + B') \cup (A' + \overline{B})$?