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Logical entailments of what, in particular? Clearly Newtonian physics -- the set of logical entailments of Netwon's principles, is not included. Newtonian definitions clearly involve guessing and observation and are definitely not apriori. Logic may be how synthetic apriori content has to be related internally, since the illogical is not really "known". ...


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The basic answer is that you have duties towards rationality both in yourself and others. Thus, you have a duty not to lie to a person who is in front of you, because in Groundwork terms you must treat humanity as an ends and never merely as a means. Since they are a human being and thereby a creature capable of rationality, you have a duty to provide them ...


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Assuming you know the intention of the person at the door, it is your moral duty to act to prevent this to the best of your ability. However, acting immoral to prevent it (such as lying) would be (somewhat) immoral, your intentions would not justify your means. Speaking truths only but not seizing a viable opportunity to prevent the murder is equally ...


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The idea is it's analytic that if something is happening NOW, something else was happening prior to now ("then"). But that one thing caused another is not analytic but synthetic.


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A hypothetical imperative is defined in Kant relative to his concept of categorical and hypothetical logic in general. Which makes it kinda weird to me that he doesn't talk about disjunctive imperatives but anyway, taking the categorical imperative, well there used to be a definition of substance as that which is not a predicate in a categorical assertion, ...


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It may be more productive to look at this from an extreme form of radical scientific skepticism. When you make a statement, like "Amy's dog is brown." You really have a theoretical and experiential basis for such a statement. You are just omitting it. It is possible that Amy's dog passed on and she now has another dog, or that the dog has aged and gone ...


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