x'=a1x+b1y
y'=a2x+b2y
1.|a-lI|=0
a.pragmatikes
 (a-l1I)v1=0, x1(t)=v1 e^(l1 t)
 x(t)=c1x1(t)+c2x2(t) ...
b.migadikes
 x=ve^mt(coswt+isinwt)=x1+ix2
 x=c1x1+...
g.pollaples
1.l diplh kai 1 eksisqsh
 duo elef.agnwst tote
 vriskw 2 idiodian. v1,v2=>x1=v1e^lt ..
 an l triplh kai treis agn.
 tote treis luseis gram. aneks
2. an l triplh kai duo eks dhl
 enan agnwsto mia lush x1=v1e^lt
 gia tis alles:
 x(t)=(tv1+v2)e^(lt)
 (A-lI)v2=v1
 ara x2=(tv1+v2)e^(lt)
 x3(t)=(t^2/2*v1+tv2+v3)e^(lt)
 (A-lI)v3=v2
3.an l triplh kai 1 eksiswsh
  dhl 2 agnwst. => v1,v2
  gia v3 san prin me arxiko dianusma
  eite v1 eite v2.

