Joel David Hamkins
I am Professor of Logic at Oxford University and Sir Peter Strawson Fellow in Philosophy at University College Oxford. I was formerly affiliated with the City University of New York (CUNY Graduate Center, Mathematics, Philosophy and Computer Science & College of Staten Island, Mathematics).
My research is mostly in logic, broadly construed, especially mathematical logic and set theory, with connections to other areas.
Find out more on my blog, mathematics and philosophy of the infinite. I also post on Twitter @JDHamkins, and on Google+.
My general policy is to try to engage with any question that I find interesting. I strive for selfcontained answers with clear explanations. I post answers to questions that I know how to answer or which I am able to figure out. I try to express my mathematical ideas in plain language when possible, preferring to avoid technical notation or terminology when I find that these obscure the idea of an argument. When clarity is enhanced by technical precision, however, I do try to provide it. I am less concerned with whether a question or answer conforms with various official rules, as long as it contains or leads to interesting mathematical ideas. For example, I feel free to make posts answering not the actual question that was asked but a related question, provided that this is interesting. In my view, answers on MathOverflow are mainly for the benefit of the broader community, rather than for the particular person who asked the question.
I regret that in all likelihood, I probably sometimes miss the inclusion of whatever original references from the literature might be relevant for an answer; unfortunately, searching the literature is not as regular a part of my answering process as it might be. I am grateful to those users who supplement posts on MathOverflow with appropriate references and citations.
Meanwhile, contemplating a mathematical puzzle on MathOverflow is one of the routine enjoyments in my life. Read my remarks on MathOverflow: the eternal fountain of mathematics.
I strongly prefer answers that explain a mathematical idea to answers that provide a reference for where that idea might be explained elsewhere. Similarly, I find questions that ask for a mathematical explanation to be more interesting than questions that ask for a reference.
My books:

Oxford, UK

Member for 10 years, 7 months

732 profile views

Last seen Apr 3 at 7:02
Communities (14)
 MathOverflow 181.3k 181.3k 2828 gold badges537537 silver badges941941 bronze badges
 Mathematics 36.8k 36.8k 88 gold badges9292 silver badges162162 bronze badges
 Mathematics Educators 3.7k 3.7k 22 gold badges1515 silver badges2626 bronze badges
 Philosophy 3.4k 3.4k 1818 silver badges2323 bronze badges
 TeX  LaTeX 992 992 66 silver badges1515 bronze badges
 View network profile
Top network posts
 311 What are some reasonablesounding statements that are independent of ZFC?
 230 Can you answer my son's fourthgrade homework question: Which numbers are prime, have digits adding to ten and have a three in the tens place?
 228 What are the most misleading alternate definitions in taught mathematics?
 198 Is the analysis as taught in universities in fact the analysis of definable numbers?
 151 Solutions to the Continuum Hypothesis
 131 Are the "proofs by contradiction" weaker than other proofs?
 129 Most 'unintuitive' application of the Axiom of Choice?
 View more network posts →
Top tags (27)
Badges (52)
Gold
Silver
Rarest

Jan 16 '14

Oct 2 '13

Aug 15 '13
Bronze
Rarest

Nov 19 '13

Aug 6 '16