# Re: [tlaplus] Specifying all states on SimpleProgram from the TLA Course

I will attempt to answer this one but welcome more knowledgeable folks to chime in.

It looks like you are asking why the range of i is not defined.

Was the range of i defined before this statement? If yes then, the range definition will cary over when you invoke i.
On Wed, Mar 17, 2021 at 10:13 PM Pablo Fernandez <fernandezpablo85@xxxxxxxxx> wrote:
I've been watching the videos on Lamport's TLA Course.

On the DieHard problem he makes a statement on why is it important to specify a state completely:

Here, he insists on adding /\ big' = big.

Now, on the SimpleProgram exercise (the first one), Add is defined like this:

Add == /\ pc = "middle"

/\ pc' = "done"

/\ i' = i + 1

My question is, if we need to specify the whole state space, shouldn't Add need to be defined this way instead?

Add == /\ pc = "middle"

/\ pc' = "done"

/\ i' = i + 1

/\ i \in 0..1000

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