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 Apr 29 comment Minimum and maximum with lagrange multiplier ok @JeanMarie others have already pointed out that. I think that this doesn't answer my theoretical question: in general can I replace nn constraints with their intersection? Apr 27 comment Minimum and maximum with lagrange multiplier but in general can I replace $n$ constraints with their intersection? Apr 27 comment Minimum and maximum with lagrange multiplier @JeanMarie updated question :) Apr 27 revised Minimum and maximum with lagrange multiplier added 37 characters in body Apr 27 asked Minimum and maximum with lagrange multiplier Feb 26 comment Doubts on inverse power method I'm not sure to have correctly understood... What's the difference if the initial vector is real or complex? Feb 24 revised Doubts on inverse power method edited tags Feb 24 asked Doubts on inverse power method Jan 31 revised How many people at the party? added 2 characters in body Jan 31 comment How many people at the party? @JimmyR. the problem is: that $n$ isn't an integer. What can I say about the number of people at the party? Jan 31 comment How many people at the party? @JimmyR. Maybe it's overkill. Is there a solution for 2-person cin-cin? Jan 31 asked How many people at the party? Dec 27 awarded Popular Question 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!