And in worksheet mode,or after click the Ctrl+J,ie insert Maple Input,

I can't use ctrl+=,that generate the results at the right hand.

Pic2 is the one after creating document block

⊆

not this form “⫋”

p := display(seq(cutout(v, 4/5), v = stellate(dodecahedron(), 3)), style = PATCH);

q := display(cutout(icosahedron([0, 0, 0], 2.2), 7/8));

display(p, q, scaling = CONSTRAINED, title = `Nested Polyhedra`)

question1:

DEtools[phaseportrait]

([diff(y(x),x)=-y(x)],y(x),x=-2.2,[[y(-2)=2],[y(-2)=1],[y(-2)=-2]],dirgrid=[17,17],arrows=LINE,axes=NORMAL);

This is the version in Maple 7?

After accessing to the help file,maybe it should be

with(DEtools):

phaseportrait(diff(y(x),x)=-y(x),y(x),x=-2.2,[[y(-2)=2],[y(-2)=1,[y(-2)=-2]],dirgrid=[17,17],arrows=LINE,axes=NORMAL);

but can't generate the resuls.

dirgrid seems not exist in the help.

question2:

http://en.wikipedia.org/wiki/Simplex