JDH

18,535 reputation

23379

bio	website	mathoverflow.net/users/1946
	location	New York, NY
	age
visits	member for	2 years, 9 months
	seen	Sep 25 '12 at 13:48
stats	profile views	2,944

I am a professor of mathematics at the City University of New York. My research is mostly connected with mathematical logic and set theory, although I have also worked in group theory, computability theory and the philosophy of mathematics. I have been active at MathOverflow, but I thought I would pop in here a bit and see how things are going.

jdh.hamkins.org

	18,535 reputation	bio	website	mathoverflow.net/users/1946	visits	member for	2 years, 9 months
23379 badges		location	New York, NY		seen	Sep 25 '12 at 13:48

summary answers questions tags badges favorites bounties reputation activity

204 Answers

votes activity newest

58	How many sides does a circle have?
57	Is infinity an odd or even number?
54	Are the “proofs by contradiction” weaker than other proofs?
47	What are the issues in modern set theory?
35	Is there such a thing as a countable set with an uncountable subset?

18,535 Reputation

+5	Can you answer my son's fourth-grade homework question: Which numbers are prime, have digits adding to ten and have a three in the tens place?
+10	Lebesgue measure of the graph of a function
+10	Countable compact spaces as ordinals
+10	Irrationality proofs not by contradiction

2 Questions

votes activity newest

120	Can you answer my son's fourth-grade homework question: Which numbers are prime, have digits adding to ten and have a three in the tens place?
42	Help me put these enormous numbers in order: googol, googol-plex-bang, googol-stack and so on

92 Tags

513 set-theory × 70	99 reference-request × 5
425 logic × 59	99 infinity × 4
165 general-topology × 23	98 order-theory × 13
137 elementary-set-theory × 17	89 computability × 15
128 model-theory × 16	87 soft-question × 13

5 Accounts

$Mathematics Stack Exchange$	Mathematics	18,535 rep	23379
	Philosophy	1,469 rep	314
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	265 rep	17
	Theoretical Computer Science	111 rep	2
	English Language & Usage	101 rep