0, 1, 2, 3, 4, 5, 6, 7, 8, 9 are all real numbers, and I is an imaginary number, so it cannot be directly represented by numbers.

My definition is, me? =- 1, which means i=√- 1.

Me? =i×i×i=- 1×i=-i

i^4=i×i×i×i=- 1×(- 1)= 1