Originally posted by TheMaster37
Bank people inventing negative numbers? Possible, but I think it more likely that mathematicians needed negative to get inverses under addition.
From the beginning not even the mathematicians didn't like negative numbers. Some didn't even accept the existence of them. They thought of negative numbers as positive with a certain property only. "Negative number of apples? Rubbish!"
Even the bankers and economists didn't like negative numbers, therefore we have something, even today, that is called 'double Italian book-keeping. Instead of counting with negative numbers they summed the positive amounts separately and called it debit, and summed the negative amounts and called it credit. No need for the minus sign. Then debit and credit should be equal, if not ... you know.
The invention of negative numbers is a great leap forward, beginning with the economists and bankers, followed by mathematicians who gave a mathematical study of them.