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We still use Roman numerals to a certain extent today but the Roman numeral system was replaced by the Hindu-Arabic numeral system because it contained a zero symbol thus making arithmetical operations a lot easier whereas the Roman numeral system has no zero symbol and mathematical operations were much more difficult.
operations of sets in algebra
The last two operations in P.E.M.D.A.S are 'addition' and 'subtraction'.
Inverse functions? (not sure what you mean)
inverse operations