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Aug
5
awarded  Famous Question
Jul
20
comment Solution of Second order ODE: theoretical question
@Dmoreno I'll try to explain better the question: in my book there is written "if we have to solve $y''+ay'+by=0$, the general idea is to find solutions like $y(x)=e^{\lambda x}$". ok, but do other y(x) exist? many thanks for your help!
Jul
20
comment Solution of Second order ODE: theoretical question
@Dmoreno no, it is a curiosity... i'm asking if the linear combination of exponentials fulfills the set of possible solutions.. :)
Jul
20
comment Solution of Second order ODE: theoretical question
is it the unique set of solutions?
Jul
20
revised Solution of Second order ODE: theoretical question
added 19 characters in body
Jul
20
comment Solution of Second order ODE: theoretical question
@Dmoreno mmmh, i know that, but my question was about the existence of a different class of solutions, that can't be expressed in the exponential form... are they possible?
Jul
20
comment Solution of Second order ODE: theoretical question
yes, I know it, but I was asking if there are possible solution that couldn't be expressed by exponentials ... thanks for your help!
Jul
20
asked Solution of Second order ODE: theoretical question
Jun
23
comment Clarification about Asymptotic comparison test for Improper integrals
you're right! many thanks!
Jun
23
asked Clarification about Asymptotic comparison test for Improper integrals
Jun
23
comment Is this function differentiable in $(1,-1)$?
@Siminore thanks a lot for your help! :)
Jun
23
comment Is this function differentiable in $(1,-1)$?
@Siminore with "test on partial derivatives" do you mean "check if they are continuous"?
Jun
23
comment Is this function differentiable in $(1,-1)$?
@Chilango I always forget to use them! ;)
Jun
23
comment Is this function differentiable in $(1,-1)$?
@Siminore yes! I have obtained the same results. I have recheck the limit: it exists and is equal to 0... I made an algebra mistake... :( Anyway, can I say that the the function is differenziable in (1,-1) because there the partial derivatives are continuous? they are quotients of continuous functions, aren't they?
Jun
23
comment Is this function differentiable in $(1,-1)$?
@Siminore I'll recheck it....
Jun
23
asked Is this function differentiable in $(1,-1)$?
Jun
23
accepted $\sum 0$: does it converge or diverge?
Jun
23
asked $\sum 0$: does it converge or diverge?
Jun
19
comment Theorem about sum/product/quotient/composition of differentiable functions
@YvesDaoust so, $x^2+y^2\neq k \pi$? I have edited the question, please, read it.. thanks!
Jun
19
revised Theorem about sum/product/quotient/composition of differentiable functions
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