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Rick16's latest activity
Rick16
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
I understand what you mean, and yet I wanted to check the validity of Taylor's result using the formal differentiation process with the...
Today, 4:10 AM
Rick16
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
I withdraw the last part of my last post. I guess technically it should be ##\frac{\partial f(y+\alpha\eta)}{\partial y}=\frac{\partial...
Today, 12:31 AM
Rick16
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
I understand that if you have a function ##f## and you take its derivative with respect to whatever you want, you get ##f'##. If...
Yesterday, 10:07 PM
Rick16
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
I have read your insight. I don't see an exact parallel to how Taylor uses ##y## in his text, except for the ambiguity in ##y##. But as...
Yesterday, 10:04 AM
Rick16
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
I see. So ##\frac{\partial f}{\partial y}## actually means ##\frac{\partial f}{\partial (y+\alpha\eta)}## here. But this only works...
Yesterday, 9:33 AM
Rick16
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
The problem with this is that ##y## does not depend on ##\alpha## and ##\frac {\partial y} {\partial \alpha}\neq \eta##.
Yesterday, 8:30 AM
Rick16
posted the thread
I
How to manipulate functions that are not explicitly given?
in
Calculus
.
Here are two examples: The first one is from Taylor's Mechanics, section 6.2: Taylor takes the function ##f(y+\alpha\eta, y' +...
Yesterday, 8:13 AM
Rick16
replied to the thread
I
Getting the sign right with the work-energy theorem
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Thanks a lot! I constantly run into problems with minus signs. I think they make up 98% of all the mistakes that I make. It's very...
Apr 2, 2024
Rick16
posted the thread
I
Getting the sign right with the work-energy theorem
in
Electromagnetism
.
This is problem 3 in section 2.3.4 from Conquering the Physics GRE by Kahn and Anderson: And here is the solution from the book: The...
Apr 1, 2024
Rick16
posted the thread
B
What ever happened to Classical Unified Field Theory?
in
Other Physics Topics
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Are there currently professional physicists who work on Einstein’s quest to unify the gravitational field and the electromagnetic field...
Mar 20, 2024
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