Let I o = and for each n e N* let I n = { 1,2,3,

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Let Io = Ø and for each n e N* let In = { 1,2,3, ... , n}.

(a) In is not equipollent to any of its proper subsets

(b) Im and In are equipollent if and only if m = n.

(c) Im is equipollent to a subset of In but In is not equipollent to any subset of Im if and only if m < n.

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