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[tlaplus] Operators interpretation -- leads_to
I've recently started working on TLA+ and came across something that I can't quite understand.
I have been experimenting with the leads_to operator. It's clear to me that F ~> G is equivalent to  ( F => <> G ) (1)
Now, let's consider a liveness properties of the form:
\forall a \in A: (a.something = "value_1") ~> (b.something_else = "value") (2)
When expressing the same using (1), it should look like:
\forall a \in A:  ( (a.something = "value_1") => <> (b.something_else = "value") ) (3)
Is that right?
Then another question is -- how's the following property interpreted?
 (\forall a \in A: (a.something = "value_1") => <> (b.something_else = "value") ) (4)
which still parses, thus it's a valid TLA+ formula.
Thank you in advance,
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