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Question to ask a reductive materialist

Is it because you know that it’s to your evolutionary advantage to think that 3+7=10 that you know that it is true,...
...OR... 
...is it because you know that it 3+7=10 is true that you know it is to your evolutionary advantage to think so?  

 If you answer that the former is correct, then you imply that mathematical truths are not so much known as they are advantageous to believe in.  And in saying that, you undermine any strong claims that you might have otherwise made about the nature of scientific knowledge.

 If, on the other hand, you select the latter option, then any appeal to evolutionary advantage is excluded, lest your argument be circular, so that you still need to explain how it is that we can know such truths.

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