- #1
- 1
- 0
- TL;DR Summary
- Can PLEASE someone help me!! I don’t understand it. (I attached a picture)
Thanks!!!!
Last edited by a moderator:
Calculus: What is the derivative of ##\phi## at a point?
- I
- Thread starter ElieQuebec10
- Start date
-
- Tags
- Calculus Derivative Point
- #2
- 18,518
- 21,365
Soit ##\phi: \longrightarrow \mathbb{R}## makes no sense. And as long as ##f## isn't defined, you can only calculate the derivative under the condition that it exists for ##f## and in dependency of ##\nabla f## in which case you have to use the chain rule.