http://invest2lf43rqx6mommjdb6el3ehbqfx3lbvlv5p53adg2kuqi7zljad.onion/titan-bitcoin/index21.html
In this way, zero is the 'medium of exchange' between the positive and negative domains of numbers—it is only possible to pass into, or out of, either territory by way of zero. By going below zero and conceptualizing negative numbers, many new and unusual (yet extremely useful) mathematical constructs come into being including imaginary numbers, complex numbers, fractals, and advanced astrophysical equations.