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64 Questions

Views Newest Activity Votes

votes

answer

views

What axioms does ZF have, exactly?

Jun 15 '16 at 13:29 dankness 730

votes

answers

views

Why study cardinals, ordinals and the like?

elementary-set-theory cardinals ordinals motivation

May 16 '14 at 17:25 Community♦ 1

votes

answers

585

views

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

set-theory math-history

Apr 28 '16 at 16:21 hardmath 29.9k

votes

answers

views

Precise meaning of “extension”?

elementary-set-theory

May 12 '15 at 15:40 goblin 37.8k

votes

answers

405

views

Ordinals - motivation and rigor at the same time

elementary-set-theory logic intuition ordinals motivation

May 13 '15 at 17:02 byserpas 447

votes

answers

723

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

votes

answer

119

views

Why are models in logic called models?

logic terminology model-theory

Nov 19 '14 at 23:43 Community♦ 1

votes

answers

150

views

Is there such a thing as the number of axioms?

logic formal-systems

Nov 20 '14 at 12:55 Community♦ 1

votes

answers

306

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 7,567

votes

answer

views

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

geometry constants

Aug 22 '14 at 10:38 Ivo Terek 50.2k

votes

answers

223

views

Trivial proof in ZFC

logic first-order-logic

Jun 11 '14 at 14:05 Community♦ 1

votes

answers

234

views

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

constants

Mar 16 '14 at 20:18 Kai Sikorski 940

votes

answers

594

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 46.2k

votes

answer

515

views

Why are power sets called power sets?

elementary-set-theory notation intuition

May 17 '15 at 10:51 wythagoras 21.8k

votes

answer

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 1,420

votes

answers

views

Is $0 $ radians an acute angle?

trigonometry terminology

Apr 27 '14 at 19:13 user132181 1,224

votes

answer

362

views

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

real-numbers

Nov 12 at 1:11 Xhicigxigxt 1

votes

answers

240

views

Truth values in formal systems

logic

May 17 '15 at 14:49 David Richerby 2,303

votes

answers

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 29.9k

votes

answers

182

views

Asperger's and math [closed]

soft-question education

Feb 12 '15 at 9:47 user132181 1,224

votes

answers

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 1,224

votes

answer

views

Confusion with Bolyai-Gerwien theorem

geometry self-learning

Jul 6 '14 at 15:59 Blue 52.4k

votes

answers

146

views

Why does manipulating the expression help? [duplicate]

real-analysis limits

May 24 '14 at 11:09 Mauro ALLEGRANZA 70.9k

votes

answers

views

Consistency of ZFC and the key assumption [closed]

set-theory philosophy foundations

May 15 '14 at 18:56 Community♦ 1

votes

answers

197

views

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

May 10 '14 at 19:58 qwr 6,864

votes

answer

113

views

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

notation nonstandard-analysis

Apr 4 '14 at 8:10 Mikhail Katz 31.1k

votes

answer

110

views

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

logic incompleteness

Oct 23 '15 at 6:44 Mike Haskel 6,369

votes

answer

views

Limits and nonstandard analysis - is my intuition correct?

limits intuition nonstandard-analysis

Aug 17 '15 at 11:48 Ian 70.6k

votes

answer

100

views

Justification for ordinal arithmetic at limit ordinals

set-theory ordinals motivation

May 19 '15 at 17:34 Asaf Karagila♦ 315k

votes

answers

449

views

Are Gödel's incompleteness theorems really about primitive recursive functions?

logic incompleteness

Mar 15 '15 at 12:25 Carl Mummert 68.9k

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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”?

Precise meaning of “extension”?

Ordinals - motivation and rigor at the same time

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

Why are models in logic called models?

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?

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

Why are power sets called power sets?

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

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

Are Gödel's incompleteness theorems really about primitive recursive functions?