echoone
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 May7 comment On the probability that two positive integers are relatively prime Cool. I did not anticipate this would lead to talk about amenable groups. I just learned about them recently in connection with the Banach-Tarski paradox and ergodic measures. May7 comment On the probability that two positive integers are relatively prime Are these "densities" the same as "Banach means" as in the first answer above? In any case, would it be correct to say that "the density that two random positive integers are coprime is $6/\pi^2$"? May6 asked On the probability that two positive integers are relatively prime Apr25 awarded Nice Question Apr21 accepted Solving a peculiar system of equations Mar23 comment Continuity of a function that maps a point to the closest point on a compact convex set I understand the proof and the idea behind. Very nice. Thanks. Mar23 accepted Continuity of a function that maps a point to the closest point on a compact convex set Mar21 comment Prove that 2 of 3 triangles sharing one side overlap That is very clever. Thanks. Mar21 asked Continuity of a function that maps a point to the closest point on a compact convex set Mar21 accepted Prove that 2 of 3 triangles sharing one side overlap Mar20 revised Prove that 2 of 3 triangles sharing one side overlap added 77 characters in body Mar20 comment Prove that 2 of 3 triangles sharing one side overlap Point taken. I have added an explicit question. I like the idea of dividing the plane as you suggested and will think about it some more. Mar19 asked Prove that 2 of 3 triangles sharing one side overlap Feb15 answered dy/dx when x and y are functions Feb14 comment dy/dx when x and y are functions I did not think about the inverse function theorem. In any case, when you write $y(t(x))$, are you treating $x$ as a dummy variable? Your last statement gave me an idea: Perhaps $dy/dx$ is the function whose value at $t$ is just $y'(t)/x'(t)$? Feb14 asked dy/dx when x and y are functions Dec7 awarded Scholar Dec7 awarded Supporter Dec7 comment Solving a peculiar system of equations Wow! What a clever solution. I like it a lot. Thanks. Dec6 awarded Editor