Question: set theory: explain work please. 7. Prove by cases that if n is a natural number, n + n + 3 is odd. 8. Use

set theory: explain work please.

7. Prove by cases that if n is a natural number, n + n + 3 is odd. 8. Use the technique of working backward from the desired conclus that (a) if x and y are positive real integers, then * = xy. Where in the proof is it essential that x and v be positive

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