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 Sep24 awarded Autobiographer Mar22 awarded Cleanup Mar9 comment What was the first bit of mathematics that made you realize that math is beautiful? (For children's book) What was their answer? Feb12 comment What is a diffeomorphism? Sorry Muphrid but I can't accept your answer since I don't have enough rep here, I +1'd it though. I don't know why the question was migrated, I was only looking for a hand-wavy definition. Jan22 answered prove or disprove that $\int_a^b |f(x)| \mathrm{d}x\geq |\int_a^b f(x)\mathrm{d}x |$ Jan20 comment How does one create a rotation about a given axis in $R^{3}$ from rotations about the other axes? This seemed to do the trick. Thanks @Shard ! Jan20 comment How does one create a rotation about a given axis in $R^{3}$ from rotations about the other axes? While it is a very nice result, I'm not sure it actually answers the question in that the matrix $\bf{R_{\hat{u}}}$ would appear difficult to decompose. Jan20 revised How does one create a rotation about a given axis in $R^{3}$ from rotations about the other axes? deleted 6 characters in body Jan20 asked How does one create a rotation about a given axis in $R^{3}$ from rotations about the other axes? Dec8 awarded Critic Nov18 awarded Scholar Nov18 accepted Can an ellipse with fixed semi-axis have different values of eccentricity? Nov18 awarded Student Nov18 awarded Citizen Patrol Nov18 asked Can an ellipse with fixed semi-axis have different values of eccentricity? Sep12 comment “Rules of thumb” to decide which convergence test is most appropriate If the answer was helpful, please consider marking it as accepted, this will give more interest in the question (rep for you) and more interest in the answer (rep for me). Sep12 comment “Rules of thumb” to decide which convergence test is most appropriate Although performing the integral test is a long-winded process, it always gives you a definite answer and so it is a powerful tool (although, are Maple or Mathematica xD). Sep12 awarded Teacher Sep12 awarded Editor Sep12 revised “Rules of thumb” to decide which convergence test is most appropriate more info