You might be familiar with Rand from a high school reading assignment.Seriously?
Hardcore objectivists often criticize liberals for basing decisions on emotion, rather than reason. My father saw our family politics no differently. In his mind, it was reasonable to ask that I emancipate myself and work for a living. To me, it felt like he was asking me to sacrifice my childhood so he didn't have to pay child support. To me, it felt like abandonment.posted by hippybear at 9:50 AM on April 16, 2011 [1 favorite]
Whatever you choose to consider, be it an object, an attribute or an action, the law of identity remains the same. A leaf cannot be a stone at the same time, it cannot be all red and all green at the same time, it cannot freeze and burn at the same time. A is A. Or, if you wish it stated in simpler language: You cannot have your cake and eat it, too.None of the things she's claiming as examples of "A is A" are examples of "A is A". She's taking "A is A" to be equivalent to "A is not B", which is something you really don't want as a general axiom, because a lot of statements of the form "A is B" are in fact true (for example, "Socrates is a man", "Zero is the additive identity", "I am the only person in this room" -- the last of which can't be a logically necessary truth, because it's going to become false in a few minutes). You can make a conceptual distinction between attributes like these and pairs of necessarily-contradictory predicates like "is all red" and "is all green", but that distinction is not found in the statement "A is A"; it's found in our knowledge of what the words "red" and "green" mean, which means it's an additional premise, and we're not simply deriving from "A is A". In fact, our statement of this additional premise would probably take a form something like "For no A is it the case that A is both all red and all green", which means we can just substitute in our leaf for A and be done without using the Law of Identity at all.
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posted by Blazecock Pileon at 6:12 PM on April 15, 2011 [1 favorite]