JohnB
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 Aug 29 awarded Scholar Aug 29 accepted Sets cut into two halves of equal size by any straight line through a particular point Aug 28 comment Notation: $\varphi$ and $\phi$ Thanks for the links, but -- what can I infer from these? Aug 28 awarded Supporter Aug 27 asked Notation: $\varphi$ and $\phi$ Aug 27 comment Sets cut into two halves of equal size by any straight line through a particular point You mean M must be point-symmetric? Aug 27 answered Show that the union over a collection of compact cubes in $\mathbb{R}^n$ is Lebesgue measurable Aug 27 asked Sets cut into two halves of equal size by any straight line through a particular point Jul 23 answered Notation of the differential operator Jul 23 comment Notation of the differential operator \newcommand{\d}{\mathrm{d}} Jul 23 comment Notation of the differential operator Writing \text{d} is not a good idea, as the shape and font used then depends on the shape and font surrounding the formula (if that's italic, the d will be italic as well). Use \mathrm{d}. May 8 awarded Student May 8 asked Common term for “present value” and “future value” Oct 8 awarded Editor Oct 8 revised Can we prove that a statement cannot be proved? deleted 9 characters in body Oct 8 comment Can we prove that a statement cannot be proved? Sorry, it's several years now that I read about it. Thanks for correcting. Oct 7 awarded Teacher Oct 7 answered Can we prove that a statement cannot be proved? Sep 27 answered how to prove, $f$ is onto if $f$ is continuous and satisfying $|f(x) - f(y)| ≥ |x - y|$ for all $x,y$ in $\mathbb{R}$