Question: What is Z * ? I've never seen this before. And which of these are valid? O Et-_1 di + E;=_1 bj = Ek=-1 (
What is Z* ? I've never seen this before.
And which of these are valid?

O Et-_1 di + E;=_1 bj = Ek=-1 ( ak + bk), n E Z, n2- 1 O (Et-, ai)! = Et= (ai!), nez O Etz ai + Et= bi = Et=1 (ai + bi), ne Z*, n21 O LEt, a; ] = Et lai ], nez, n2 1
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