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 Nov 21 awarded Popular Question Dec 16 awarded Caucus Nov 4 awarded Good Question Jul 7 awarded Yearling Jul 2 awarded Curious Mar 19 awarded Notable Question Jul 10 answered Series expansion of $\ln(\sec x + \tan x)$? Jul 1 awarded Yearling May 12 answered Show if $x^2$ is divisible by $5$ then $x$ is divisible by $5$ as well May 6 awarded Caucus Feb 22 awarded Popular Question Dec 24 awarded Critic Dec 15 answered Inference in a probabilistic Bayes network Dec 15 accepted Prove that the statement implies the Axiom of Choice Dec 14 comment Prove that the statement implies the Axiom of Choice @BrianM.Scott: Oh nice, I have not seen this trick before! Well I think that solved my problem. If you add that as an answer, I'd be happy to upvote. Dec 14 revised Prove that the statement implies the Axiom of Choice added 327 characters in body Dec 14 asked Prove that the statement implies the Axiom of Choice Sep 26 comment What does the notation $|f(A)| = X$ mean? Ah yes, I misread the question. Here $f(A)$ refers to the image of $A$ under $f$ and so the output is always a set. So in this case, the notation must mean cardinality. Sep 26 answered What does the notation $|f(A)| = X$ mean? Aug 8 comment Showing that $2^{17} - 1$ is prime. @tomasz: Well I divide better than I sieve :P