Popopo

609 reputation

226

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A student in Philosophy but also curious in many fields.

I don't know,

But I want to know.

	609 reputation	bio	website		visits	member for	11 months
226 badges		location	Pop Star, MathCraft		seen	53 mins ago

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58 Questions

views newest activity votes

votes

answers

370

views

What is straight line?

nov 26 at 6:14 Yury 3,368

votes

answers

347

views

Fractional calculus in complex analysis

complex-analysis fractional-calculus

sep 30 at 18:36 vesszabo 1,428

vote

answers

276

views

Do $\omega^\omega=2^{\aleph_0}=\aleph_1$?

set-theory cardinals ordinals

jun 7 '12 at 6:59 Asaf Karagila 90.9k

votes

answers

268

views

Hyperreal measure?

measure-theory elementary-set-theory nonstandard-analysis

mar 1 at 5:26 Popopo 609

votes

answer

263

views

Does Black have a winning strategy in Gomoku(freestyle)?

computational-complexity game-theory

jan 20 at 9:53 joriki 92.6k

votes

answers

259

views

Is probability objective?

probability probability-theory information-theory philosophy

sep 27 at 3:46 Popopo 609

votes

answer

243

views

Which side has winning strategy in Go?

game-theory open-problem

dec 27 at 19:22 Ed Pegg 2,081

vote

answers

224

views

What's the definition of limit of sets(esp. ordinals) in set theory?

limit set-theory convergence ordinals

jun 11 '12 at 14:25 Martin Sleziak 20.4k

votes

answers

215

views

Which set is unwell-orderable?

elementary-set-theory cardinals axiom-of-choice ordinals

sep 19 at 12:13 Asaf Karagila 90.9k

votes

answers

205

views

Are the Join and Meet operators on complete lattices both continuous?

limit order-theory lattice-orders

nov 5 at 16:59 Popopo 609

votes

answers

203

views

Proving that for infinite $\kappa$, $|[\kappa]^\lambda|=\kappa^\lambda$

set-theory cardinals

mar 14 at 12:24 Popopo 609

votes

answer

200

views

How many maximal consistent sets are there on a $\mathscr{FOL}$

combinatorics logic filters

jun 28 at 9:48 Levon Haykazyan 1,992

votes

answers

164

views

Is the negation of Gödel's completeness theorem consistent with $ZF$ without AC?

logic axiom-of-choice model-theory compactness

nov 27 at 19:13 Asaf Karagila 90.9k

votes

answers

163

views

$\wp^{(\omega)}(A)=?$

elementary-set-theory induction ordinals powers

jun 14 '12 at 15:48 Henning Makholm 53.6k

votes

answer

162

views

Cardinality of the set of ultrafilters on an infinite Boolean algebra

combinatorics set-theory order-theory boolean-algebra lattice-orders

jun 8 '12 at 19:33 Asaf Karagila 90.9k

votes

answer

159

views

Could Residue theorem be seen as a special case of Stokes' theorem?

calculus complex-analysis differential-forms

sep 19 at 13:46 David Speyer 18.7k

votes

answers

143

views

Are there rules in the useage of prepositions in Math?

soft-question terminology article-writing

mar 30 at 18:09 amWhy 54.6k

votes

answer

137

views

Can an infinite cardinal number be a sum of two smaller cardinal number?

set-theory cardinals axiom-of-choice infinity

nov 10 at 11:23 Asaf Karagila 90.9k

vote

answers

136

views

How to solve real-time games?

algorithms game-theory

jan 22 at 7:56 Michael Greinecker♦ 12.5k

votes

answer

131

views

Can we get uncountable ordinal numbers through constructive method?

set-theory infinity ordinals constructive-mathematics

jun 7 '12 at 11:37 Asaf Karagila 90.9k

vote

answer

130

views

Is $\mathbb N$ definable in $\mathbb C$?

abstract-algebra logic model-theory

nov 29 at 12:27 Asaf Karagila 90.9k

-2

votes

answer

125

views

Why infinite sums of positive real constants definitely yield infinite?

sequences-and-series measure-theory infinity

nov 11 at 22:48 Asaf Karagila 90.9k

vote

answers

120

views

Which kind product of non-zero number non-zero cardinal numbers yields zero?

elementary-set-theory cardinals axiom-of-choice

nov 10 at 16:03 Greg Ros 599

votes

answers

119

views

How many partial order on a n-set?

combinatorics open-problem

nov 8 at 3:12 Popopo 609

vote

answers

118

views

Should every line be infinite in both two directions?

geometry metric-spaces

nov 18 at 15:27 Popopo 609

votes

answers

117

views

What's the name of this operator?

abstract-algebra set-theory category-theory model-theory

jun 9 '12 at 14:40 Henning Makholm 53.6k

votes

answer

116

views

Prove/Disprove $f$ continuous iff $f[\mathring{A}]\supseteq\mathring{f[A]}$

homework general-topology

sep 26 at 11:26 Kevin Carlson 3,514

vote

answers

109

views

Can we find a nice definition of Congruence in Topology?

general-topology model-theory

jun 14 '12 at 4:16 Popopo 609

votes

answer

102

views

Does Axiom of Choice naturally hold?

elementary-set-theory axiom-of-choice

nov 10 at 8:10 Asaf Karagila 90.9k

votes

answer

102

views

Is one structure elementary equivalent to its elementary extension?

logic model-theory

dec 9 at 15:23 tomasz 7,100