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## Homework Statement

hello, i am stucked at an article from sciencedirect . somewhere it gives me the following equation and then it tells that this equation must have 4 complex roots!

the variable is lambda and we want to find 4 lambda complex roots

## Homework Equations

λ^4=0

## The Attempt at a Solution

i am amazed how we can get 4 complex roots from this equation as it seems to have roots equal to zero !

Any help would be greatly appreciated!