What is −i-i exactly?

We all know that i doesn’t have any sign: it is neither positive nor negative. Then how can people use i for anything?

Also, we define i a number such that i2=1. But it can also be seen that (i)2=1. Then in what way is i different from i? If it isn’t, then why do we even have something like a i?


The vector (1,2) is also neither positive nor negative, yet there is value in having the operation (1,2)=(1,2).

Note: there is no natural meaning for “positive” for vectors, this is just an analogy.

Source : Link , Question Author : P.K. , Answer Author : vadim123

Leave a Comment