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 Jul 2 awarded Curious Dec 27 awarded Yearling Apr 19 awarded Critic Apr 16 answered Is there a metric space whose circles look like Euclidean squares? Apr 16 asked Would this be a metric? Apr 15 answered Nice examples of groups which are not obviously groups Apr 15 answered How do you solve an equation involving the Weierstrass p-function? Apr 15 answered Measurable with respect to the product measure Apr 15 answered Given a real number, how do I produce an elliptic curve with j-invariant equal to that number? Apr 15 asked How do you solve an equation involving the Weierstrass p-function? Apr 15 asked Given a real number, how do I produce an elliptic curve with j-invariant equal to that number? Apr 8 comment If $f$ and $g$ are integrable, then $h(x,y)=f(x)g(y)$ is integrable with respect to product measure. But I need to prove that also, so I need h to be integrable in order to use Fubini's theorem Apr 8 revised If $f$ and $g$ are integrable, then $h(x,y)=f(x)g(y)$ is integrable with respect to product measure. added 35 characters in body Apr 8 asked If $f$ and $g$ are integrable, then $h(x,y)=f(x)g(y)$ is integrable with respect to product measure. Apr 8 accepted If a function is integrable over the whole space, then is it zero except on a set of finite measure? Apr 8 comment If a function is integrable over the whole space, then is it zero except on a set of finite measure? Yeah I can use harmonic series to show 1/x can't be finite around 0. Is that right? Apr 8 asked If a function is integrable over the whole space, then is it zero except on a set of finite measure? Apr 8 comment Are open sets in $\mathbb{R}^2$ countable unions of disjoint open rectangles? Wait, do i need these rectangles to be disjoint to conclude that the countable union is measurable? Apr 8 comment Is the set of sequences of natural numbers with trailing zeros countable? Wait isn't the set of finite subsets of $\mathbb{N}$ countable? Apr 8 asked Is the set of sequences of natural numbers with trailing zeros countable?