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Questions about discrete mathematics: Can a binary operation have no unit element and two zero elements? Urgent! ! ! ! ! !
There can be no unit element, such as all positive even numbers about multiplication, but if there is a unit element that must be unique, there can also be no zero element, but if there is a zero element that must be unique, the following simple proof: If zero element 1 and zero element 2 are two zero elements, then

Zero 1= zero 1* zero 2= zero 2

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