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When I used Mathematica in graduate school, I would ubiquitously specialize a variable and then later "un"specialize it. Specifically, for example, I would write v:= x^3; Then, later, when I wanted the symbol "v" to be left symbolically, I would redefine it with nothing following the definition v:=; I forgot the exact syntax, but it was something like this. But, I cannot find this feature in Maple. Yet I badly need it. Currently, for me to recover the use of a symbolic variable name like 'v', I have to CLOSE DOWN MY DOCUMENT and REOPEN IT! Secondly, in Mathematica, I easily evaluated the "independent" variable to a value and then could get the value for the dependent variable. The syntax was something like: e.g. v:=x^3; x/.->3; v; would return 27. Actually, in Mathematica, I believe the semicolons SUPPRESSED the output, the reverse with Maple. Finally, how DO I suppress output in Maple? I hope (demand, since I paid for Maple out of my own pocket) that Maple can do everything Mathematica can do. Thank you for your help.

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