Two Elaborations
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Illustrations using criteria previously applied in constructing scientific hierarchy:
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Obsolescence rate:
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psychology/sociology > history > English psychology/sociology < political science < art history < English (cf. philosophy)



Lecture disfluency:
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See also analytical series developed by Bliss (1935) through Gnoli (2008) and empirical demonstrations like Hemlin (1993) demonstrations like Hemlin (1993)