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PhilGoetz comments on The Universal Medical Journal Article Error - Less Wrong Discussion
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You certainly gave me the most-favorable interpretation. But I just goofed. I fixed it above. This is what I was thinking, but my mind wanted to put "black(x)" in there because that's what you do with ravens in symbolic logic.
A) Not everything is a raven: !∀x raven(x)
B) Everything is not a raven: ∀x !raven(x)
The new version is much clearer. My interpretation of the old version was that y was something like "attribute," so you could say "Not every black thing has being a raven as one of its attributes" or "for every black thing, it does not have an attribute which is being a raven." Both of those are fairly torturous sentences in English but the logic looks the same.