## Let m be a natural number ...

1. The problem statement, all variables and given/known data

Let m be a natural number. Find the flaw in the statement below. Explain why the statement is not valid, and change one symbol to correct it.

"If T is a set of natural numbers such that 1) m $$\in$$ T and 2) n $$\in$$ T implies n+1 $$\in$$ T, then T = {n $$\in$$ N : n ≥ m}
2. Relevant equations

Dunno.

3. The attempt at a solution

Part 2) of the if statement tells us that T is an infinite set. I'm not sure exactly how 1) and 2) are connected. Hmmmm ...

Help me get started.

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Hmmm ...

T is going to look something like {k, k+1, k+2, ...}, where k≥1 is an integer. That's basically what the second condition tells me.

m is some element in T. That's all I know about m. Could m-1 be in T? As long as m>k.

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## Let m be a natural number ...

So is their equation for T correct?

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