Hi,

I'm testing sage, the expressions and I play with expr.expand().

After test = 3*x, I find test.expand? and get the help text, and 
test.expand?? and the main call about expand.

Then emacs goes to expression.pyx at the lines defining the interface 
(outer) function expand.

In this code I find :
   
        _sig_on
        cdef GEx x = self._gobj.expand(0)
        _sig_off
        return new_Expression_from_GEx(self._parent, x)
   

Where is this mysterious method self._gobj.expand(0) ?

F.

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