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 Tumbleweed
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  • 40 votes cast
Apr
27
accepted Clarification about correct steps to follow for second order ODE
Apr
27
comment Clarification about correct steps to follow for second order ODE
Thanks, Abel! It's clear now!
Apr
27
comment Clarification about correct steps to follow for second order ODE
@LutzL I'm sorry, I haven't understood what you mean..
Apr
27
comment Clarification about correct steps to follow for second order ODE
I have understood: the problem is that I don't know the method of undetermined coefficients. I only know the variation of constants method. I have searched something on the net, but I have only found the rules to follow, but not the reason why I can use them... In particular, I haven't understood why $y''+ay'+by=f$ admit, as particular solution, $z=ax^2+bx+c$... To establish this rule, have they guessed and found that this relation is always valid? Are there any other reasons?
Apr
27
comment Clarification about correct steps to follow for second order ODE
I'm sorry, Abel. I haven't understood why the particular solution is in the form $y = ax^2 + bx + c $..
Apr
27
asked Clarification about correct steps to follow for second order ODE
Apr
27
accepted Clarification about second order Linear ODE with constant coefficients
Apr
10
asked Clarification about second order Linear ODE with constant coefficients
Mar
10
comment Prove that the limit doesn't exist
@BrianDing Have you guessed and were you so lucky or have you followed a proceeding like Kristoffer's one? :)
Mar
10
accepted Prove that the limit doesn't exist
Mar
10
comment Prove that the limit doesn't exist
oh, it's very interesting! I didn't think to set some values for b and c... so many thanks!
Mar
10
asked Prove that the limit doesn't exist
Feb
23
awarded  Tumbleweed
Feb
16
accepted Prove the relation related to this Fourier Transformate
Feb
16
comment Prove the relation related to this Fourier Transformate
wonderful! and what about the proof that $\hat{f}(p)$ is real?
Feb
16
asked Prove the relation related to this Fourier Transformate
Feb
16
revised Convolution, clarification about exercise
deleted 1 character in body
Feb
16
asked Convolution, clarification about exercise
Feb
8
accepted Convolution and absolute value
Feb
8
comment Convolution and absolute value
It is very clear, thanks a lot!