O Owen Ransen Aug 2019 5 0 Italy Jan 31, 2020 #1 Hello, please see the attached image, the author of the book says it is the application of the chain rule, but it seems different to me. If it was a chain rule thing then there would be z-squared on the "outside" and (tk -ok) on the "inside", and z = tk-ok. Or have I misunderstood some ways of using the chain rule?

Hello, please see the attached image, the author of the book says it is the application of the chain rule, but it seems different to me. If it was a chain rule thing then there would be z-squared on the "outside" and (tk -ok) on the "inside", and z = tk-ok. Or have I misunderstood some ways of using the chain rule?

romsek Math Team Sep 2015 2,875 1,608 USA Jan 31, 2020 #2 This is a perfect example of the chain rule.

O Owen Ransen Aug 2019 5 0 Italy Jan 31, 2020 #3 romsek said: This is a perfect example of the chain rule. Click to expand... Sorry to ask, but could you go through it step by step, it does not seem to follow other examples I've found...

romsek said: This is a perfect example of the chain rule. Click to expand... Sorry to ask, but could you go through it step by step, it does not seem to follow other examples I've found...

O Owen Ransen Aug 2019 5 0 Italy Jan 31, 2020 #4 It may be that I did not consider the original function; does the chain rule work in this case? Can it be used in this case, because o is a function of w? TIA! Last edited by a moderator: Jan 31, 2020

It may be that I did not consider the original function; does the chain rule work in this case? Can it be used in this case, because o is a function of w? TIA!

romsek Math Team Sep 2015 2,875 1,608 USA Jan 31, 2020 #5 It can always be used. If $o_k$ is not a function of $w_{jk}$ then $\dfrac{\partial}{\partial w_{jk}}o_k = 0$ Reactions: Owen Ransen

It can always be used. If $o_k$ is not a function of $w_{jk}$ then $\dfrac{\partial}{\partial w_{jk}}o_k = 0$