User talk:Tohline/Appendix/Ramblings/T3Integrals

Third Component of dx/dt Equation

Jay: In the email message that you sent to me today, you indicated that you had added the 3rd component of the dx/dt equation on this page. I don't see that addition. --Tohline 15:00, 29 May 2010 (MDT)

Christoffel Symbols for Orthogonal Coordinate Systems

Jay: As I am comparing your expressions (involving Christoffel symbols) for time-derivatives of the unit vectors to the expressions I have used (drawn from an Appendix in Binney & Tremaine), I notice that certain terms in your expressions just don't show up in my expression for, for example, A, B, and C. I suspect that this is because the expressions I have stolen from Binney & Tramaine assume that we're using an orthogonal coordinate system. Perhaps you should therefore highlight (or group together) which Christoffel symbols always go to zero when using an orthogonal coordinate system. --Tohline 15:33, 29 May 2010 (MDT)