User Matt N. - Mathematics Stack Exchange

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	15,230 reputation	bio	website		visits	member for	2 years, 4 months
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3

votes

1

answer

58

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Taking fractions $S^{-1}$ commutes with taking intersection

commutative-algebra modules

jun 13 '12 at 15:50 Dylan Moreland 13.4k

0

votes

1

answer

58

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Question about chains and lattices

order-theory

oct 13 '11 at 9:54 Brian M. Scott 154k

1

vote

2

answers

57

views

Measure spaces such that the semi-norm is a norm

measure-theory

jul 8 at 20:35 Davide Giraudo 56.2k

1

vote

1

answer

57

views

Localization and Noetherian property

commutative-algebra

jul 25 at 6:25 Dylan Moreland 13.4k

1

vote

0

answers

57

views

Proof that for every $X$ $\exists !$ one initial ordinal

elementary-set-theory ordinals

dec 9 at 10:42 Matt N. 15.2k

0

votes

1

answer

57

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Proof of “ordinal if and only if is Mostowski collapse”

elementary-set-theory ordinals

dec 5 at 17:48 Asaf Karagila 90.7k

2

votes

1

answer

57

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If $Y$ not transitive then $\in$ not extensional?

elementary-set-theory

nov 12 at 8:54 Asaf Karagila 90.7k

0

votes

2

answers

56

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How to finish proof that $T$ has an infinite model?

logic model-theory

nov 19 at 17:30 Carl Mummert 25.4k

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4

votes

1

answer

56

views

How to conclude $\Re $ is zero?

hilbert-spaces

jul 31 at 15:24 Davide Giraudo 56.2k

1

vote

0

answers

55

views

Fourier series of $f(x,y)$

homework real-analysis functional-analysis

nov 2 '11 at 9:16 Matt N. 15.2k

2

votes

1

answer

55

views

Proof that isomorphic strict partial orders have same Mostowski collapse

elementary-set-theory ordinals

dec 5 at 22:02 tohecz 698

1

vote

2

answers

54

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Proof of all submodules of $M$ are f.g. then $M$ is Noetherian

commutative-algebra modules

jul 21 at 20:24 Arturo Magidin 158k

3

votes

2

answers

53

views

Proof of $R/I$ integral over $S/(S \cap I)$

commutative-algebra ideals

jul 6 at 12:37 Matt N. 15.2k

1

4

votes

1

answer

53

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Constructing a Bernstein set in a Polish space

descriptive-set-theory transfinite-recursion

dec 12 at 20:34 Arthur Fischer 21.3k

1

vote

1

answer

53

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Quickie on Boolean valued models

model-theory forcing

dec 27 at 10:35 Clive Newstead 15.3k

2

votes

1

answer

51

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Possible typo in Just/Weese's set theory

logic cardinals model-theory

dec 22 at 9:57 Asaf Karagila 90.7k

4

votes

2

answers

51

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Question about proof of Hessenberg: $\kappa \cdot \lambda = \lambda$

elementary-set-theory cardinals ordinals

dec 13 at 13:43 Asaf Karagila 90.7k

4

votes

1

answer

51

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“For every countably complete filter $F$ there is a countably complete ultra filter $H$ s.t. $F \subset H$” is false

elementary-set-theory filters

nov 30 at 9:30 Matt N. 15.2k

2

votes

2

answers

51

views

Two questions related to the “almost disjoint number” $\mathfrak a$

set-theory

apr 18 at 9:57 Asaf Karagila 90.7k

1

vote

1

answer

51

views

Alternative proof or typo?

commutative-algebra

jun 15 '12 at 11:27 Johannes Kloos 4,206

2

votes

1

answer

47

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Why is $B[x]/M$ algebraic over $B/m$?

commutative-algebra

jul 19 at 18:05 Georges Elencwajg 44.8k

2

votes

2

answers

47

views

Equivalent characterisation of consistent

logic model-theory

nov 19 at 11:09 Asaf Karagila 90.7k

3

votes

1

answer

46

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Dissecting a proof of the $\Delta$-system lemma (part II)

set-theory axiom-of-choice

apr 30 at 13:42 Matt N. 15.2k

3

votes

1

answer

45

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Question about a proof that there is no formula $fin(x)$

model-theory

nov 23 at 11:35 Arthur Fischer 21.3k

4

votes

1

answer

43

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Question about definition of $\kappa$-completeness of filter

set-theory definition filters

apr 16 at 14:02 Asaf Karagila 90.7k

2

votes

1

answer

43

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Disjointifying sets if indexed by set that doesn't admit a well-order?

elementary-set-theory order-theory

oct 22 at 16:40 Brian M. Scott 154k

0

votes

1

answer

42

views

Follow up on cinquefoil knot

algebraic-topology knot-theory

sep 10 at 11:38 Matt N. 15.2k

0

votes

2

answers

39

views

How to make this function injective?

elementary-set-theory

oct 26 at 15:18 Brian M. Scott 154k

1

vote

1

answer

39

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Model of a language $L$ vs. model of a theory $T$ in $L$

elementary-set-theory model-theory

nov 23 at 12:43 Arthur Fischer 21.3k

1

3

votes

0

answers

39

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Follow up on “Proof of $X \times X \hookrightarrow X$ implies $[X]^2 \hookrightarrow X$”

elementary-set-theory axiom-of-choice

dec 3 at 12:39 Matt N. 15.2k

Matt N.

428 Questions