(1) In this question on math.SE a question about the meaning of 'either' before a list which ends with 'and'. The meaning of
either a, b, c, or d
is from this answer sort of clear in that it means a or b or c or d. Even if or can mean all included, the either seems to indicate an exclusivity. so exactly one of them. But what does
either a, b, c, and d
mean? Is this even current English?
(2) in the same question there is the question about what
any one of a, b, c, and d
means. So I would also like to know what
any one of a, b, c, or d
means?