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recovering from forgetfulness


Is there a way in Mathematica to recover from forgetting to include a 
package?  For example, I type:

ImplicitPlot[x^2+y^2==1,{x,-1,1}]

and Mathematica returns the same thing back.  So I go, "Ooops, I forgot 
to load a package."  So I type:

<<Graphics`ImplicitPlot`

but instead of being all nice and good this gives me errors like:

Set::write:Tag ImplicitPlot in Options[ImplicitPlot] is Protected.

Clear[ImplicitPlot] does not help.  Even after trying to load 
ImplicitPlot, I am still stuck with an expression that just evaluates to 
itself.

Is there any way to reset Mathematica without quitting even the kernel?

Thanks,

Michael
michael at qni.com



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