Expression

An Expression is an object containing only one Exponented, but what will be displayed with its associated name, like in: A = 5x + 4x(7 - 9x)
An interesting method of Expression is auto_expansion_and_reduction() which will created automatically all the steps of expansion and reduction of any expression.

Possible args for __init__():
<a name as a letter or a number>, Exponented

None seems to be accepted instead of Exponented, check why and maybe suppress this curious possibility

Fields:
right_hand_side: here's the Exponented

Debugging info: no dbg_str(), so far

Check Expression's complete doc

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