Hi, I m trying to find out, what is imaginary unit/number. i^2

[PlanckShift]

But ε² = 0 remember? Think about it. How do you find the inverse of a+bε? Rationalize the expression using ε² = 0. Then find where the resulting expression is undefined.

 

[Number Nine]

But ε² = 0 remember? Think about it. How do you find the inverse of a+bε? Rationalize the expression using ε² = 0. Then find where the resulting expression is undefined.

But where is the inverse of ε?
Hint: It's 1/ε, which you said was undefined. It doesn't have an inverse, so your structure isn't a field.