Identity in Euclidean Domain
let A be a ring that is commutative and also has a euclidean norm function
d.Then A must have an multiplicative identity.
here d is a function from nonzero elements of A to nonnegative integers
satisfying the property: for every a and nonzero b in A there exists q and
r in A such that a=bq+r and either r=0 or d(r)
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