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Question

Let A = [-1, 1], B = [-1, 1], C = [0,). Let {(x,y)ϵ A×B:x2+y2=1} and R2={(x,y)ϵ A×C:x2+y2=1}

A
R1 defines a function from A into B
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B
R2 defines a function from A into C
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C
R1 defines a function from A onto B
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D
R2 defines a function from A onto C
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