=+18.2. 2.91 Suppose that X = Y is uncountable and 2= ? consists of the count- able

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=+18.2. 2.91 Suppose that X = Y is uncountable and 2= ? consists of the count-

able and the cocountable sets. Show that the diagonal E = [(x, y): x =y] does not lie in 2x 2, even though [y: (x, y) € E] € 9 and [x: (x, y) E E] E for all x and y.

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