How do we show that the set
(P, Q, R, P1, Q1, R1, P2, Q2, R2..)
(where the numbers are subscripts)
I guess I need to find a one-one mapping onto natural numbers, but how? there are three sequences, so can't use even and odd numbers..
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- Thread Starter
- 24-01-2010 20:05
- 24-01-2010 20:14
If you really want to use even-odd numbers you could create a countable set containing the P's and Q's and then combine that with the R's.
But if even/odd numbers combine two sequences, how would you combine three?