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Using by if n, m are natural numbers then m+n is not equal to n, prove...

Using by if n, m are natural numbers then m+n is not equal to n, prove that if n<=m and m<=n then n=m (This is the reflexive property of an order relation. )

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Law of trichotomy : given any two natural numbers m,n exactly one of the following holds, m=n ; m<n ; m>n.

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