Think of the smallest number greater than 0...

[The Ceej]

I don't know what maths your brother teaches, but if he tells his students that complex or negative numbers don't exist he had better have a watertight alternative set of number theories.

I never said that. I said he doesn't teach imaginary numbers. And he refuses to teach imaginary numbers. He refuses to acknowlege imaginary numbers. And as someone who's been through the required education and works in the field, that should tell you something about imaginary numbers.

If your money owed is positive then the money you have in the bank is negative, you can't multiply one side by something and not the other

net=owed+owned, and if that's not a negative owed, then everyone would be a lot richer than they were. You can't use debt to pay anyone

I have a positive amount of money in my bank account. I owe a positive amount of money to my credit card. No negatives numbers exist there. These are two different accounts. Take something from me which I don't have. I challenge you. One you have done that, I will have a negative of what you have taken and you will have a positive due to the fact you've taken it. It can't be done.