User Matt N. - Mathematics Stack Exchange

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	15,275 reputation	bio	website		visits	member for	2 years, 4 months
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4

3

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answer

43

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The Subspace $M=\{f\in C[0,1]:f(0)=0\}$

homework functional-analysis

may 14 at 13:18 Norbert 20.3k

1

vote

0

answers

33

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Proof of Lie theorem on solvable Lie algebra

may 11 at 8:39 user37116 681

4

8

votes

1

answer

253

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Tightness and countable intersection of neighborhoods

general-topology set-theory cardinals

may 5 at 11:52 Alex Ravsky 3,344

1

vote

1

answer

56

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induced map homology example

general-topology algebraic-topology homology

apr 24 at 22:45 Steven 6

2

6

votes

3

answers

59

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introductory reference for Hopf Fibrations

reference-request algebraic-topology homotopy-theory vector-bundles

may 1 at 12:57 Mud 163

2

8

votes

3

answers

249

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Do we usually assume the consistency of ZFC when we use forcing?

set-theory forcing

apr 24 at 1:52 hot_queen 662

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4

votes

0

answers

45

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Topics of advanced functional analysis

functional-analysis

apr 19 at 14:59 Student 21

4

9

votes

1

answer

106

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Does a nonlinear additive function on R imply a Hamel basis of R?

analysis logic set-theory axiom-of-choice

apr 19 at 17:57 Keshav Srinivasan 74

5

7

votes

3

answers

840

views

Choosing a PhD topic

soft-question advice career-development

apr 12 at 15:14 Willie Wong♦ 30.7k

5

12

votes

1

answer

212

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Every Tychonoff space is an image of a moscow space under a continuous open mapping.

general-topology topological-groups

apr 17 at 7:12 Alex Ravsky 3,344

1

2

votes

1

answer

71

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when is $\mathbb P_{\mathcal {A}}$ separative?

set-theory

apr 1 at 1:08 Brian M. Scott 154k

2

8

votes

1

answer

110

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Failure of Choice only for sets above a certain rank

logic set-theory axiom-of-choice forcing

mar 27 at 23:10 Asaf Karagila 91k

1

vote

1

answer

88

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Prove that the closed unit ball of $L^2[a,b]$ is closed in $L^1[a,b]$

real-analysis normed-spaces lp-spaces

mar 23 at 17:25 Matt N. 15.3k

5

19

votes

1

answer

212

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When is Stone-Čech compactification the same as one-point compactification?

general-topology compactness

mar 27 at 5:32 Martin Sleziak 20.3k

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26

votes

4

answers

417

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To show that the set point distant by 1 of a compact set has Lebesgue measure $0$

real-analysis measure-theory compactness geometric-measure-theory

mar 13 at 17:48 Dave L. Renfro 6,596

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4

votes

3

answers

88

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Understanding presentations of groups

group-theory group-presentation

mar 10 at 11:14 Alexander Gruber♦ 15.2k

4

3

votes

1

answer

112

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The space of Riemann integrable functions with $L^2$ inner product is not complete

real-analysis functional-analysis measure-theory

mar 9 at 20:33 copper.hat 28.5k

2

5

votes

2

answers

121

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Nets and compactness in topological spaces.

general-topology convergence compactness

mar 8 at 17:59 Tomás 3,940

2

10

votes

2

answers

236

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Fourier series of function $f(x) = \begin{cases}0 & \text{if }-\pi<x<0 \\ \sin(x) & \text{if }0<x<\pi \end{cases}$

complex-analysis integral fourier-series

may 5 at 2:18 hafeed 1

2

13

votes

1

answer

135

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Is $\mathbb{Q}^2$ homeomorphic to $\mathbb{Q}^2\setminus \{0\}$?

general-topology metric-spaces

mar 7 at 19:20 Caloric 575

1

3

votes

1

answer

71

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Topology of manifolds

algebraic-geometry differential-geometry algebraic-topology manifolds

mar 3 at 14:14 Piotr Pstragowski 1,087

1

3

votes

2

answers

110

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Identifying the Quotient Space in $\mathbb{R}^3$

homework general-topology algebraic-topology

mar 4 at 8:15 goobie 168

3

4

votes

1

answer

242

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Tychonoff theorem (1/2)

general-topology compactness filters

apr 10 at 16:46 dolan 114

2

votes

1

answer

64

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How does one define a standard model of ZFC?

set-theory model-theory

feb 22 at 1:35 Asaf Karagila 91k

19

21

votes

9

answers

3

kviews

A really complicated calculus book

calculus reference-request differential-geometry algebraic-topology

feb 26 at 11:48 Dave Hartman 548

2

4

votes

1

answer

54

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Continuous, selfadjoint and compact?

operator-theory compactness compact-operators

feb 8 at 22:30 Byron Schmuland 15.4k

1

0

votes

1

answer

68

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Express $C$ in terms of the sets $A_n$

real-analysis

jan 1 at 15:24 saz 5,457

110

106

votes

35

answers

7

kviews

Fun but serious mathematics books to gift advanced undergraduates.

reference-request soft-question big-list

feb 25 at 22:57 arielf 101

2

12

votes

2

answers

159

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Applications of model theory to analysis

real-analysis complex-analysis soft-question model-theory

dec 23 at 8:26 Seirios 8,917

8

24

votes

2

answers

833

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Proof by contradiction vs Prove the contrapositive

logic proof-strategy proof-theory

jan 31 at 1:27 amWhy 54.6k

Matt N.

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