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 October 15th, 2018, 05:49 AM #1 Newbie   Joined: Oct 2015 From: algeria Posts: 5 Thanks: 0 Directional derivative of exponential of a function I have a trouble of a directional derivative of a function : for a function f and a tangent vector field X of a manifold M, we have X(f)=âˆ‡_{X}f=<âˆ‡f,X> From this above formula, is it true that : X(e^{-f})=<âˆ‡e^{-f},X>==-e^{-f}<âˆ‡f,X> If it not true, what is X(e^{-f})? Tags derivative, directional, exponential, function Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post suhdude Calculus 1 March 10th, 2016 03:34 PM itchygo Calculus 2 November 8th, 2015 04:02 PM supaman5 Linear Algebra 0 November 26th, 2012 10:14 AM chrill3123 Calculus 5 April 21st, 2012 06:51 PM mathman2 Calculus 6 November 5th, 2009 05:51 PM

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