Arthur Fischer

Moderator ♦ less info

network profile

21,364 reputation

21750

bio	website
	location
	age
visits	member for	2 years, 2 months
	seen	50 mins ago
stats	profile views	1,618

summary answers questions tags badges favorites bounties reputation activity

527 Answers

votes activity newest

40	Infinite sets don't exist!?
31	Theorems with an extraordinary exception or a small number of sporadic exceptions
23	How to prove that $ \text{int}(\text{cl}(A)) = \text{cl}(\text{int}(A)) $?
21	Is the closure of a Hausdorff space, Hausdorff?
16	Example of a conjecture/theorem which required an entirely new idea to prove

view more

21,364 Reputation

+20	Topology on Integers such that set of all Primes is open
+10	$f^{-1}(U)$ is regular open set in $X$ for regular open set $U$ in $Y$, whenever $f$ is continuous.
+20	When is Stone-Čech compactification the same as one-point compactification?
+10	Set of limit points of a subset of a Hausdorff space is closed.

view more

0 Questions

votes activity newest

This user has not asked any questions

103 Tags

613 general-topology × 203	143 cardinals × 34
458 set-theory × 113	94 model-theory × 27
320 elementary-set-theory × 72	87 homework × 42
258 logic × 69	72 axiom-of-choice × 19
151 real-analysis × 49	69 ordinals × 22

view more

7 Accounts

$Mathematics Stack Exchange$	Mathematics♦	21,364 rep	21750
	Area 51	151 rep	1
	Stack Overflow	101 rep
	Meta Stack Overflow	101 rep	1
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	101 rep

38 Badges

recent class name

Enlightened × 5	Good Answer × 2
Nice Answer × 19	cardinals
Talkative	Convention
Caucus × 2	Yearling × 2
set-theory	general-topology

view more

0 Active bounties

active offered earned

This user has no active bounties

2,054 Votes Cast

all time			by type			month		week		day
2,043	up		1,094	question		102		23		3
11	down		960	answer		102		23		3

Technology			Life / Arts	Culture / Recreation	Science	Other
Stack Overflow Server Fault Super User Web Applications Ask Ubuntu Webmasters Game Development TeX - LaTeX	Programmers Unix & Linux Ask Different (Apple) WordPress Answers Geographic Information Systems Electrical Engineering Android Enthusiasts IT Security	Database Administrators Drupal Answers SharePoint User Experience Mathematica more (14)	Photography Science Fiction & Fantasy Seasoned Advice (cooking) Home Improvement more (13)	English Language & Usage Skeptics Mi Yodeya (Judaism) Travel Arqade (gaming) Bicycles Role-playing Games more (22)	Mathematics Cross Validated (stats) Theoretical Computer Science Physics more (7)	Stack Apps Meta Stack Overflow Area 51 Stack Overflow Careers

site design / logo © 2013 stack exchange inc; user contributions licensed under cc-wiki with attribution required

rev 2013.5.24.702