- #1
1MileCrash
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Homework Statement
My DE book claims that
[itex]\frac{d\mu(t)/dt}{\mu(t)}[/itex]
is equivalent to
[itex]\frac{d}{dt}ln|\mu(t)|[/itex]
But says nothing to justify this claim.
Can you?
1MileCrash said:But says nothing to justify this claim.
1MileCrash said:I see how from the bottom, the top follows by direct application of the chain rule.
But given the top, I don't know how to come to the bottom expression.
This all seems kind of pointless. Integrating ##\frac{d\mu(t)/dt}{\mu(t)}## to get ##\ln|\mu(t)|##, you've used the fact you're trying to show, so why bother? Also, the righthand side is only equal to qt if q is a constant, which it most likely isn't.1MileCrash said:That's not really my issue. I just like to see it written out even if it is recognizable - I can integrate and differentiate until the cows come home.
Nonetheless:
[itex]\frac{d\mu(t)/dt}{\mu(t)} = q[/itex]
Integrating both sides
[itex]ln|\mu(t)| = qt[/itex]
1MileCrash said:q is constant, I just put it there so I could visualize it thoroughly.
Bacle2 said:though I don't know why they dropped the absolute value
"DE book does not justify this claim" means that the evidence presented in a certain book is not sufficient or convincing enough to support a specific claim or argument.
To determine if a claim in a book is justified or not, you should critically evaluate the evidence provided and see if it is supported by reliable sources, data, and logical reasoning.
If you come across a book that does not justify its claims, you can seek out other sources to verify the information or challenge the author's argument by presenting counter-evidence or logical arguments.
No, a book cannot be considered valid if it does not justify its claims. A valid book should present evidence and arguments that are supported by reliable sources and logical reasoning.
To avoid falling for unjustified claims in books, it is important to critically evaluate the evidence presented, conduct your own research, and seek out multiple perspectives on the topic. It is also helpful to consult with experts or fact-checking websites.