Differential Equations

[jermaink]

Hi everyone,
I'm dealing with the following D.E.. I don't get why the solution is the one below. Thanks for your help in advance

 

[Deleted member 4993]

Hi everyone,
I'm dealing with the following D.E.. I don't get why the solution is the one below. Thanks for your help in advance
View attachment 25925

It is integration of ln(lambda).

What did you expect to get?

 

[jermaink]

Thanks for your reply. I'd just understand how to infer the solution. By the way, r is a function of t, and "tau" and "n" are constant parameters