{VERSION 4 0 "IBM INTEL NT" "4.0" }
{USTYLETAB {CSTYLE "Maple Input" -1 0 "Courier" 0 1 255 0 0 1 0 1 0 0 
1 0 0 0 0 1 }{PSTYLE "Normal" -1 0 1 {CSTYLE "" -1 -1 "Times" 1 12 0 
0 0 1 2 2 2 2 2 2 1 1 1 1 }1 1 0 0 0 0 1 0 1 0 2 2 0 1 }}
{SECT 0 {EXCHG {PARA 0 "" 0 "" {TEXT -1 19 "Figure2.2.5; page27" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 14 "with(DEtools):" }}}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 63 "de1:=diff(x(t),t)=-x(t)-3*y(t):\nde
2:=diff(y(t),t)=-x(t)-3*y(t):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 
0 46 "opts:=color=black,linecolor=red,stepsize=0.05:" }}}{EXCHG {PARA 
0 "> " 0 "" {MPLTEXT 1 0 48 "Grid:=dirgrid=[12,12],arrows=medium,thick
ness=2:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 175 "Ivps:=[[x(0)=4,
y(0)=0],[x(0)=3,y(0)=0],[x(0)=1,y(0)=0],\n[x(0)=2,y(0)=0],[x(0)=0,y(0)
=-4],[x(0)=0,y(0)=-3],\n[x(0)=0,y(0)=-2],[x(0)=0,y(0)=-1],[x(0)=0,y(0)
=1],\n[x(0)=0,y(0)=2]]:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 93 "
Rectangle:=t=-10..10,x=-5..5,y=-5..5,\ntitle=\"Phase portrait Ex 2.2.5
 with a zero eigenvalue\":" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 
55 "DEplot([de1,de2],[x(t),y(t)],Rectangle,Ivps,Grid,opts);" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}}{MARK "9" 0 }{VIEWOPTS 
1 1 0 1 1 1803 1 1 1 1 }{PAGENUMBERS 0 1 2 33 1 1 }