On pages 22 and 23 of H. K. Dass's Mathematical Physics, I read that both normal and directional derivatives are solved by finding the gradient of a surface and then putting a Cartesian value of a point on that surface in the the answer of gradient. I don't understand what makes them different or why they have different names if they are the same thing. For example, eigenvalues of a matrix have other names but it is specified that they are the different names of the same value.
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1Thank You. I am humbly grateful – Navjot Singh Nov 15 '21 at 12:51
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I misinterpreted your question. I deleted my previous comment since it is not correct. – Student Nov 15 '21 at 13:07
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it's okay. to err is human , ain't no computer. – Navjot Singh Nov 20 '21 at 16:47