Hi all.
I'm a newbie on TLAPS and need some help.
Can not manage to prove a simple fact
LEMMA LEM1 == ASSUME NEW S1, NEW S2,
NEW Set \in SUBSET {<<x, y>> : x \in S1, y \in S2},
NEW p \in Set
PROVE p[1] \in S1
OBVIOUS
Set of tuples is not supported.
However
LEMMA LEM2 == ASSUME NEW S1,
NEW Set \in SUBSET {x : x \in S1},
NEW p \in Set
PROVE p \in S1
OBVIOUS
works.
Should we accept LEMMA1 as an axiom?
Thanks in advance.
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