Messages

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MAT244 Math--Lectures / How can I decide what type of the local phase portrait is

« on: December 05, 2014, 05:22:42 PM »

firstly, if the linear system I solved is center, how can I decide the locally linear system is center or spiral?
secondly, if the linear system I solved is two equal real eigenvalue, how can I decide wether it is node or spiral points?
I did the problem on the text book, in the answer it just said it is center or spiral, undetermined, do we need to write the exact type in final?   

2

MT / Re: MT Problem 4

« on: November 19, 2014, 11:19:43 AM »

but t <2, how can I get ln(t-2) ?