Well, I remembered this after having Algebra II a year ago, is it possible that this is a valid proof that 1=−1?
1=√1=√−1⋅−1=√−1⋅√−1=i⋅i=i2=−1
∴1=−1
So is this actually fully valid? Or can it be disproved?
Answer
I think the problem is between √−1˙−1 and √−1˙√−1.
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