Comment by chucksmash

If M is the set of all imessage users and S is "has received a blue dot spam message", then:

gkoberger said:

∃m∈M ¬S(m)

then mmlgr said pardon me, but:

∃m∈M S(m)

and then you were like:

∃m∈M S(m)≡¬∃m∈M ¬S(m)

but I've got to tell you:

∃m∈M S(m)≡¬∀m∈M ¬S(m)

∃m∈M ¬S(m)≡¬∀m∈M S(m)

∃m∈M S(m)≢∀m∈M S(m)