y''+fy'+gy=h
|y1  y2 |
|y1' y2'|=W(x)
W'+fW=0
y1,y2 luseis, y1-y2 lush omogenous.

Staf.Suntel:y''+ay'+b'=h
vriskw l:l^2+al+b=0
l1,2eR -yo=c1e^(l1x)+c2e^(l2x)
l1=l2  -yo=c1e^(l1x)+c2xe^(l2x)
l=m+-in-yo=e^mx(c1cosnx+c2sinnx)
merikh lush:
ap:c1'(x)y1(x)+c2'(x)y2(x)=0
pr:c1'(x)y1'(x)+c2'(x)y2'(x)=h(x)
 ym=c1(x)y1+..
Prosd:
h(x)=Pn(x)(gcos(tx)+dsin(tx))e^(bx)
ym=x^k(An(x)costx+Bn(x)sintx)e^(bx)
k=0 an x.e den exei riza to b+ti

Genikh grammikh:
y(x)=z(x)y1(x).
y'=z'y1+zy1'
y''=z''y1+2z'y1'+zy1''
antikathistw
thetw z'(x)=u(x),z''=u'
lunw th grammikh 1 takshs
oloklhr. kai antikathistw.
