SOLUTION: is there any proof for root over -1 is equal to i

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Question 534205: is there any proof for root over -1 is equal to i
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
i is the sqrt of -1. It's what it's called, there's no proof.
Sometimes j is used instead of i, often when i or I denotes electric current.