# [Iris-Club] Typos (, I think,) in the Iris 2.0 documentation

Jeehoon Kang jeehoon.kang at sf.snu.ac.kr
Wed Aug 17 15:38:15 CEST 2016

>
> How that? We have L(s1) = {T}, so the tokens overlap, so no state set
> containing s1 can be closed if T is in the token set.
> What happens here is that closure({s1},{T}) is not actually closed,
> which is caused by the input being "ill-formed".  So, in that sense the
> closure fails to be complete (it's not always producing something
> closed).  However, the combination of the state set {s1} and the token
> set {T} doesn't make any sense to start with (since T \in L(s1)), so
> "garbage in, garbage out" applies. ;)
>

Ah I see!  I interpreted the definition in a wrong way, by inserting
parenthesis in wrong places:
"closed(S, T) , ∀s ∈ S. ((L(s) # T ∧ ∀s 0 . s T −→ s 0) ⇒ s 0 ∈ S) "

In essence, I was confused about the precedence between /\ and =>.  I know
it is an established convention, and yet I think it would be helpful to
insert some redundant parenthesis for readers ;-)

Thank you,
Jeehoon

--
Jeehoon Kang (Ph.D. student) <http://sf.snu.ac.kr/jeehoon.kang>
Software Foundations Laboratory <http://sf.snu.ac.kr>
Seoul National University <http://www.snu.ac.kr>
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