> f1 := (x^2 + 3*y^2)*exp(-x^2 - y^2);

> plot3d(f1, x=-2..2, y=-2..2, axes = normal);

> f2 := (x^2 + 3*y^2)*exp(-x^2) - y^2;

> plot3d(f2, x=-2..2, y=-2..2, axes = normal);

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> > assume(y>1); > f:=(x,y,z) -> -y^x+z; > limit( f(x,y,z), x=infinity ); > This post generated using the online HTML conversion tool Download the original worksheet

> > integers:= [$1..20]; > select(isprime, integers); > remove(isprime, integers); > This post generated using the online HTML conversion tool Download the original worksheet

I am using x in the place of I to avoid confusion with complex I.

> restart:

> eqn:=-p*(x^2-a^2)^(3/2)+q*a^3;

>

> S:=[solve(eqn=0, a)];

Warning, solutions may have been lost

>

> simplify(S, symbolic);

>

>

In your calculation by hand you should have a = absolute value (your solution). Thus, the first two solutions above.

Hope that helps.

Thomas

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An additional question: I just set up a newsreader. When I get information from Maple Primes I only receive original post. I do not seem to get any of the replies to the post. Have I set it up incorrectly or is this the only information that gets sent on RSS? Thanks, Thomas

Choose preferences: Display: Input display: Maple Notation and Output display 2-D Math Notation. Then when you open a new worksheet Text, not Math should be highlighted and it should say C Maple Input. This will be the red executable text that you want for all your programming and work. If you click on Math it will change to C 2D Input which is like the 2D input in document mode. If you want this input you might as well just work in document mode. It seems backward but that is what seems to work. That is, you want Text not Math selected when you work in worksheet mode with Maple Input. If you want plain text you can click on the T icon at the top and the cursor icon next to it to change back. You can still use all the palettes, but it will enter an integral as int(f,x) not as a symbol. These really help if you forget what to type for a certain command, just click on the symbol and it will insert the command. In response to what you posted in the other thread, I think the 1-D input in the manual refers to pc users only. They have a classic worksheet that is not available to mac users.