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 Mar 10 awarded Yearling Mar 10 awarded Yearling Nov 27 awarded Enlightened Nov 27 awarded Nice Answer Oct 7 awarded Popular Question Mar 10 awarded Yearling Nov 26 revised Conservation of ang. momentum for paths reaching a rotation axis rewrote some of the latex Nov 26 suggested approved edit on Conservation of ang. momentum for paths reaching a rotation axis Nov 26 comment Direction of friction when a car turns similar question physics.stackexchange.com/questions/79852/… Nov 26 revised Use kirchhoff's second law to deduce the resistance R of the resistor added pictured and used latex Nov 26 suggested approved edit on Use kirchhoff's second law to deduce the resistance R of the resistor Nov 26 comment Some strange transformation What strange transformations? Nov 26 comment Some strange transformation You probably know this formula $tr(A)=ln[Det(e^{A})]$. If there exists a matrix $B$, invertible, such that $A=ln(B)$ the following is true $tr[ln(B)]=ln[det(B)]$. Nov 26 revised What is the significance of electron spin quantum number? added 145 characters in body Nov 26 answered What is the significance of electron spin quantum number? Nov 24 comment The Weyl tensor and gravitational waves See this article on Weyl tensor and gravitational waves arxiv.org/abs/1309.2768 Nov 24 comment Speed of light, lasers and mass I'm glad you found my answer helpful. Nov 24 revised C, T, P transformation mistakes in Peskin&Schroeder's QFT''? deleted 1 characters in body Nov 24 answered C, T, P transformation mistakes in Peskin&Schroeder's QFT''? Nov 24 revised Thermodynamics and wall insulation rewrote it with latex