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RE: The Differentiation Onion Method for Chain Rule – Part 1
Alternatively, you can think of Matryoshka dolls from Russia, where upon taking out a doll, you find a smaller doll inside it.
This is how I usually think of Chain Rule. Work from the outside to the inside. The onion method you propose here is a good one as well.
The Onion method is same as working from the outside in. Maybe it's a mnemonic -- we always peel onions from the outside. We never peel onions from the inside out. :-)