positive integer non-negative mathematicians REAL negative numbers were certainly disliked and resisted positive number Positive or negative positive positive negative sign weren't accepted negative numbers Wikipedia on the history of negative numbers negative numbers were certainly disliked and resisted positive negative Francis Maseres, 1759 Positive or negative Positive or negative http://en.wikipedia.org/wiki/Negative_and_... REAL Francis Maseres, 1759 Negative Integers negative positive