Now, if Man evolved by natural selection, we would expect imperative logic to actually be more rather than less interesting than formal logic.
Consider
1) It is obligatory that the letter is mailed.To my mind, this adds something to the notion of what imperative or deontic statements do- what they must do if Man evolved by natural selection-and that is they open up more possibilities for free choice, more methods of individuation, more avenues of rebellion, precisely when they pile up on each other to push one down a path narrower than the sword's edge and suspended over an abyss.
(2) It is obligatory that the letter is mailed or the letter is burned.
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