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explanation need!


Hello.

Can somebody expalin the following code (which is used in order to
"block" the use of the RootReduce function by FullSimplify; this
example is adopted by Peter Pein's post here:

http://groups.google.gr/group/comp.soft-sys.math.mathematica/browse_thread/thread/d41fc3a44456c75c/5155017508beef3b?lnk=gst&q=&rnum=9&hl=el#5155017508beef3b
)

In[7]:=
<< "Developer`"
ClearCache[]
s3 = Block[{RootReduce}, FullSimplify[Solve[1 + x^2 + x^3 == 0]]]

More specifically why is needed to change context first?
What does the function ClearCache here in particular?
Should the following command give a different output?

In[10]:=
$Context

Out[10]=
"Global`"

Thanks a lot!

Dimitris



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