Some time ago I suggested in sage-support (http://groups.google.com/group/sage-support/browse_thread/thread/b391ed6bd14cdfd0)

I'd like to propose that certain special names should be protected so that they could not become variable names (for example pi, e, and i)

if by accident you assign them like:

e=factorial(10)

and then you need to need to use e with it's standard meaning, like

e^100

you will have a very hard to spot error ( (factorial(10)^100).

In that occation I did not create a ticket, but now I have:

http://trac.sagemath.org/sage_trac/ticket/8317

and the thread is better placed in sage-support

thanks!

Oscar

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