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Published online by Cambridge University Press: 15 March 2011
Scant attention has been paid to this subject by Western writers, so even an incomplete approach to it may not come amiss. The field being far too wide for any attempt at comprehensiveness within the space of a short article, I have singled out the numerical categories, since they offer a fairly coherent and manageable group.
* Here and afterwards in this article a numeral in bold type refers to the respective item in the list of writings at the end.