2.5.9. For each statement, decide whether it is true or false. Justify your answer briefly. (a) {(x, y): x, y ER and a-1 = 0} C {(x,y): x, y E R and æ²–x = 0} (b) {x ER: r – 2x = 0} CQ (c) NER (d) Z x RCR x Z (e) N x ZCQ × R

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