There is a shortcut due, I think, to Joe Riel: In 2dmath input mode, in a Document, enter these keystrokes: x_0 (x,shift+underscore,0) don't press enter Use the mouse to select the subscripted x0. Right-click to get the context-menu. Select this context-menu command: 2-D Math -> Convert To Then, in the final submenu, toggle the box titled "Atomic identifier". If you use the shortcut shown above, right click, solve->isolate for should work - it does for me. However, using the palette to enter the subliteral, then trying to right click, solve->isolate fails to do anything. Looks like a bug. Hope this helps. J. Tarr

Will has asked for a message when people notice spam that has escaped his controls. I've sent him a message asking for this to be removed. J. Tarr

Why does the second example take 1/20th the time of the first, which appears identical? J. Tarr

Why does the second example take 1/20th the time of the first, which appears identical? J. Tarr

You are right. But don't create it using keystrokes (ctrl+underscore) because if you assign it a value, you will create a table. Please see ?type,table example 2.7. Hope this helps. J. Tarr

Doug, You might like to try this. Tools>Tasks>Browse>Calculus>Derivatives>Applications>TangentLine. Enter your second example (sin(x), x=1), click Compute Details and look at the f'(x) box. One might expect it to be the same as in your post, but no, Maple has other ideas! Should we laugh, or cry? J. Tarr

Jerry, Welcome to Maple! Try copying and pasting this into a new worksheet in worksheet mode: restart; eq1 := z = 3*x^2 + 2*y^2 - 3*x + 4*y - 5; # equation of surface eq2 := z = x + 1/2 + y - 1 - 31/4; # equation of tangent plane plot3d([rhs(eq1),rhs(eq2)],x=-3..3,y=-3..3,axes=boxed,orientation=[-55,75]); The arguments rhs(eq1) and rhs(eq2) tell the plot3d command to use the Right Hand Sides of eq1 and eq2. Take a look at the help pages for plot3d and plot3d,option and they'll show you how to use this command and individualize the plot. Hope this helps. J. Tarr

Assuming that you are asking why many worksheets use x_1, a_3, etc instead of x[1], a[3], etc, the reason is that assigning a subscripted variable produces a table - please see ?table - which can produce unexpected effects. J. Tarr

A colon missing after print(i) in the inner loop is causing the error. But the way to do what you want is to use the combinat package, something like this: restart; L:=[0,1,2]: combinat[permute](L,2); Hope this helps. J. Tarr

Maplesoft has foreseen your wish. Visit the Maplesoft Documentation Center and download these documents for free: Getting Started Guide, Introductory Programming Guide and Advanced Programming Guide. Or, you can purchase printed copies. Hope that gratifies your wish! J. Tarr

Perhaps this is a solution: restart; eq1:=A/(G+1/(1/V+1/(Y+1/(1/Z+1/X1))))/2=M1; eq2:=A/(G+1/(1/V+1/(Y+1/(1/Z+1/X2))))/2=M2; eq3:=A/(G+1/(1/V+1/(Y+1/(1/Z+1/X3))))/2=M3; sol := solve({eq1,eq2,eq3},[Z,Y,V,G]): seq( simplify(eval(eq||i,sol[2])),i=1..3); # check sol[2] is a solution seq( simplify(map(allvalues,sol[2]))[i], i = 1..7); Does this help? J. Tarr

Click Input format, then click More Information about formatting options. Hope this is is what you want. J. Tarr

In your example, if you press end at the beginning of the for loop line and then the down arrow, the cursor should step down to the end of the print(a) line. Is this what you need? Hope this helps. J. Tarr

In a long expression containing several variables with assumptions, the trailing tildes can make the output look messy and sometimes difficult to read. Someone suggested a different color for symbols with assumptions, instead of the trailing tilde. Would that be possible? J. Tarr

It would be nice to have the facility Acer suggests. gamma (lower case) is a case in point. It's the symbol representing the ratio of specific heats at constant pressure and constant volume, much used in thermodynamics, and thus the exponent in the adiabatic expansion law, p*v^gamma = constant AFAIK Euler's constant doesn't appear in thermodynamics, so we can get by with the unprotect mechanism, but I would still like to see Acer's suggestion implemented. J. Tarr