CommutativeOperation

This is the mother class of Sum and Product. It was created to factorize code between these two classes.

Fields	Methods (provided)	Methods (must be reimplemented)
info	get_info()
compact_display	get_compact_display()
	get_first_letter()
	get_sign()
	set_info()
	set_compact_display()
	set_sign()
	evaluate()
	dbg_str()
	contains_exactly()
	contains_a_rounded_number()
	append()
	remove()
	throw_away_the_neutrals()
	is_displ_as_a_single_neutral()
	is_displ_as_a_single_numeric_Item()
	is_displ_as_a_single_int()

Check CommutativeOperation's complete doc

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