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 Nov 12 comment Will a ball slide down a lumpy hill over the same path it rolls down the hill? The difficult part is showing that the constraint for no slipping and its angular momentum doesn't affect the path taken by the center of mass when it's allowed to slip. Nov 10 comment Will a ball slide down a lumpy hill over the same path it rolls down the hill? @RonMaimon I've done a search on Amazon.com for that reference in your answer, but I can't find it; is it an old rare book? Nov 1 awarded Popular Question Oct 27 accepted How to show that $(\xi\eta-\eta\xi)|A\rangle = 0$? Oct 27 revised How to show that $(\xi\eta-\eta\xi)|A\rangle = 0$? improve clarity Oct 27 asked How to show that $(\xi\eta-\eta\xi)|A\rangle = 0$? Oct 27 comment Reading the Feynman lectures in 2012 @ArtBrown I've seen the book on Amazon.com and after looking at the contents, I'm still scratching my head over the whole point of it: Physicists use QED, engineers use CED and both models are brilliantly served by main stream text books. Oct 24 asked How does independence of the basic bras affect the choice of numbers used to represent a ket? Oct 14 accepted Should the eigenkets be weighted in $|P\rangle = \sum\limits_{r}|\xi^r\rangle$? Oct 13 comment Should the eigenkets be weighted in $|P\rangle = \sum\limits_{r}|\xi^r\rangle$? every ket-vector can be expressed as a sum of a set of unity weighted eigenvectors? I find this hard to believe. Oct 12 asked Should the eigenkets be weighted in $|P\rangle = \sum\limits_{r}|\xi^r\rangle$? Oct 5 comment Why does Dirac write $\langle\xi'|\overline{f(\xi)} = \overline f(\xi ')\langle\xi'|$? @KyleKanos Why doesn't Dirac just substitute $\xi'$ into $\overline{f(\xi)}$ as for (34)? Oct 5 comment Why does Dirac write $\langle\xi'|\overline{f(\xi)} = \overline f(\xi ')\langle\xi'|$? @KyleKanos Dirac uses $\xi$ for a real linear operator, ' to label objects connected with eigenvalues-- $\xi'$ for an eigenvalue, $\langle\xi'|$ for an eigenbra Oct 5 asked Why does Dirac write $\langle\xi'|\overline{f(\xi)} = \overline f(\xi ')\langle\xi'|$? Sep 24 accepted How does Dirac conclude that $X_r(c_r)$ cannot vanish? Sep 24 accepted What experiments compete with BICEP 2, and when are their results expected? Sep 24 asked How does Dirac conclude that $X_r(c_r)$ cannot vanish? Sep 23 accepted How does Dirac form this conjugate imaginary equation? Sep 23 comment How does Dirac form this conjugate imaginary equation? @ACuriousMind This is page 30 of his book where the basic mathematical framework is based around there being a function of a ket, amongst other things. You really need to have a look at the book to see what I mean. Sep 22 asked How does Dirac form this conjugate imaginary equation?