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 Aug 31 revised We know the dimension of the Koch snowflake's perimeter, but does it have a measure? added 17 characters in body Aug 27 awarded Autobiographer Aug 16 awarded Good Answer Jun 2 awarded Yearling May 19 comment Is there a general formula for $\sin{(\frac{n \pi}{2})}$? Certainly there is, other than that formula. What other functions would you use? When I was a kid I programmed in BASIC where the built-in functions did include sin but also such things as int and abs... oeis.org is also interesting. Apr 26 revised Arthur Milgram photo added 204 characters in body Apr 26 revised Arthur Milgram photo added 204 characters in body Apr 26 answered Arthur Milgram photo Apr 26 accepted Is the size of the Online Encyclopedia of Integer Sequences bounded by aleph-null? Apr 20 comment Is the size of the Online Encyclopedia of Integer Sequences bounded by aleph-null? So, the sequences that exist have the cardinality of the continuum, the sequences that we can ever describe have the cardinality of the integers, and the sequences that we ever have described have finite cardinality? Aleph-two and beth-two for example are entirely out of the question, I think? I'm not 100% clear on uncountables. Apr 20 asked Is the size of the Online Encyclopedia of Integer Sequences bounded by aleph-null? Mar 6 awarded Tumbleweed Feb 22 awarded Yearling Nov 16 awarded Benefactor Nov 9 comment Why is ${x^{\frac{1}{2}}}$ the same as $\sqrt x$? We might think it's equally sensible to define the special case $0^0$ as $0$, but the mathematical convention for that is indeed $0^0 = 1$ in accord with the explanation above. Nov 9 revised Is there a rational way to conceptualize an irrational number? I had reversed the footnotes (links)? Fixed. Nov 9 comment What are the most overpowered theorems in mathematics? "The Axiom of Choice is obviously true; the Well Ordering Principle is obviously false; and who can tell about Zorn's lemma?" — Jerry Bona. I like how that joke sums up intuitions (rather than logic) regarding the Axiom of Choice and Zorn's Lemma. Nov 9 awarded Promoter Nov 9 comment We know the dimension of the Koch snowflake's perimeter, but does it have a measure? It has a positive and finite Hausdorff measure, am I right? I haven't carefully read and thought through what Hausdorff measure is all about. Nov 9 comment How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen? Horrible, yes. But logically, what's wrong with questioning the mathematical model that pairs integers with pigs? They can indeed literally disintegrate.