friendlyfrog

4 ms·

1. 1.▲
   Suit filed against Chicago Internet taxes(chicagotribune.com)

   2 points by friendlyfrog 11y ago|0 comments
2. 2.▲
   by friendlyfrog 14y ago

   It's not arbitrary. It comes directly from the axiomatics.
3. 3.▲
   by friendlyfrog 14y ago

   No it's not. i is a number such that i^2 = -1 by definition.
4. 4.▲
   by friendlyfrog 14y ago

   Imaginary numbers are defined. Imaginary numbers are not rotations or anything else that I keep hearing. Those are all properties of the fact that we define an imaginary number to be z = a + bi, where a and b are real numbers, and i^2 = -1.