User user132181

17

28

votes

1

answer

1k

views

What axioms does ZF have, exactly?

Jun 15 '16 at 13:29 dankness 1,023

8

19

votes

5

answers

2k

views

Why study cardinals, ordinals and the like?

elementary-set-theory cardinals ordinals motivation

May 16 '14 at 17:25 Community♦ 1

4

13

votes

5

answers

641

views

When can ZFC be said to have been “born”?

set-theory math-history

Apr 28 '16 at 16:21 hardmath 33.2k

3

10

votes

2

answers

526

views

Ordinals - motivation and rigor at the same time

elementary-set-theory logic intuition ordinals motivation

May 13 '15 at 17:02 byserpas 499

2

9

votes

5

answers

2k

views

Precise meaning of “extension”?

elementary-set-theory

May 12 '15 at 15:40 goblin GONE 62.8k

7

votes

2

answers

920

views

Modern book on Gödel's incompleteness theorems in all technical details

reference-request logic book-recommendation incompleteness

Mar 5 '15 at 11:48 Community♦ 1

4

7

votes

1

answer

135

views

Why are models in logic called models?

logic terminology model-theory

Nov 19 '14 at 23:43 Community♦ 1

4

5

votes

5

answers

862

views

How to make sense out of the $\epsilon-\delta$ definition of a limit?

calculus limits intuition epsilon-delta motivation

Aug 26 '17 at 7:06 Martin Sleziak 52k

2

5

votes

3

answers

155

views

Is there such a thing as the number of axioms?

logic formal-systems

Nov 20 '14 at 12:55 Community♦ 1

2

5

votes

3

answers

658

views

What's “the most right” symbol to use for “defined to be equal to”?

soft-question notation

Sep 24 '14 at 21:25 k170 8,026

1

5

votes

1

answer

104

views

Is $e$ involved in some geometric figure in any way?

geometry constants

Aug 22 '14 at 10:38 Ivo Terek 63.7k

3

5

votes

3

answers

225

views

Trivial proof in ZFC

logic first-order-logic

Jun 11 '14 at 14:05 Community♦ 1

5

votes

2

answers

245

views

If $\pi $ is a normal number, is $\tau $ one?

constants

Mar 16 '14 at 20:18 Kai Sikorski 975

2

4

votes

1

answer

806

views

Why are power sets called power sets?

elementary-set-theory notation intuition

May 17 '15 at 10:51 wythagoras 23.5k

3

4

votes

1

answer

70

views

Do only discs, sectors of discs, annuli, sectors of annuli and parallelograms have this property?

geometry

Nov 3 '14 at 23:49 Chas Brown 1,530

5

4

votes

4

answers

633

views

Why is a sphere in an $n $-dimensional space called $(n-1) $-sphere?

terminology

May 18 '14 at 12:15 Pockets 590

1

4

votes

4

answers

2k

views

Is $0 $ radians an acute angle?

trigonometry terminology

Apr 27 '14 at 19:13 user132181 2,347

2

3

votes

1

answer

517

views

What's this number called and what are its properties?

real-numbers

Nov 30 at 18:54 user855526 1

1

3

votes

3

answers

244

views

Truth values in formal systems

logic

May 17 '15 at 14:49 Community♦ 1

3

votes

2

answers

1k

views

Does the arithmetic mean minimize the sum of absolute values of deviations? [duplicate]

algebra-precalculus statistics optimization

Mar 21 '15 at 16:54 hardmath 33.2k

1

3

votes

0

answers

198

views

Asperger's and math [closed]

soft-question education

Feb 12 '15 at 9:47 user132181 2,347

3

votes

3

answers

102

views

What is wrong with the proof of this incorrect formula for the probability of $A\cap B$?

probability proof-verification

Aug 23 '14 at 17:46 user132181 2,347

1

3

votes

1

answer

100

views

Confusion with Bolyai-Gerwien theorem

geometry self-learning

Jul 6 '14 at 15:59 Blue 62.4k

3

votes

4

answers

155

views

Why does manipulating the expression help? [duplicate]

real-analysis limits

May 24 '14 at 11:09 Mauro ALLEGRANZA 82.4k

2

3

votes

2

answers

2k

views

Consistency of ZFC and the key assumption [closed]

set-theory philosophy foundations

May 15 '14 at 18:56 Community♦ 1

3

votes

3

answers

199

views

If $\pi $ is normal, can it be used as a random number generator?

pi

May 10 '14 at 19:58 qwr 9,067

3

votes

1

answer

117

views

Difference between $\mathrm {d} x$ and $\delta x $

notation nonstandard-analysis

Apr 4 '14 at 8:10 Mikhail Katz 34.3k

1

2

votes

1

answer

127

views

Infinitely many nonequivalent unprovable statements in ZFC because of Gödel's incompleteness theorem?

logic incompleteness

Oct 23 '15 at 6:44 Community♦ 1

1

2

votes

1

answer

83

views

Limits and nonstandard analysis - is my intuition correct?

limits intuition nonstandard-analysis

Aug 17 '15 at 11:48 Ian 82.5k

2

votes

1

answer

118

views

Justification for ordinal arithmetic at limit ordinals

set-theory ordinals motivation

May 19 '15 at 17:34 Community♦ 1

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64 Questions

What axioms does ZF have, exactly?

Why study cardinals, ordinals and the like?

When can ZFC be said to have been “born”?

Ordinals - motivation and rigor at the same time

Precise meaning of “extension”?

Modern book on Gödel's incompleteness theorems in all technical details

Why are models in logic called models?

How to make sense out of the $\epsilon-\delta$ definition of a limit?

Is there such a thing as the number of axioms?

What's “the most right” symbol to use for “defined to be equal to”?

Is $e$ involved in some geometric figure in any way?

Trivial proof in ZFC

If $\pi $ is a normal number, is $\tau $ one?

Why are power sets called power sets?

Do only discs, sectors of discs, annuli, sectors of annuli and parallelograms have this property?

Why is a sphere in an $n $-dimensional space called $(n-1) $-sphere?

Is $0 $ radians an acute angle?

What's this number called and what are its properties?

Truth values in formal systems

Does the arithmetic mean minimize the sum of absolute values of deviations? [duplicate]

Asperger's and math [closed]

What is wrong with the proof of this incorrect formula for the probability of $A\cap B$?

Confusion with Bolyai-Gerwien theorem

Why does manipulating the expression help? [duplicate]

Consistency of ZFC and the key assumption [closed]

If $\pi $ is normal, can it be used as a random number generator?

Difference between $\mathrm {d} x$ and $\delta x $

Infinitely many nonequivalent unprovable statements in ZFC because of Gödel's incompleteness theorem?

Limits and nonstandard analysis - is my intuition correct?

Justification for ordinal arithmetic at limit ordinals