Order of License

In PPQ (vol. 67, p. 6) Grice deals with Davidson's proposed emendation of Reichenbach's 'hideous effect': all events are the same.

Grice writes:

"We might," however, "while retaining the
principles, PROHIBIT the use of the
'co-referentiality principle' after the
'logical equivalence principle' has been used."

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For this Grice considers:

N -- Napoleon was the emperor of France

C -- Caesar was murdered by Brutus

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xs(y(y=y & N/C) = y((y=y)

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"Such a [prohibition]," Grice notes, "would indeed
have some intuitive appeal, since in the rejection of
Reichenbach's 'hideous consequence' its initial
depolyment of the 'logical equivalence principle' seems
to be tailored to the production of a sentence
which will provide opportunity for trouble-raising
application of the OTHER principle. And it that is what
the game is: why not stop it?" (PPQ, vol. 67, p. 6)