Ask Language Log: One = only one?
Keith Ellis got into an argument with a friend about the meaning of the number one, and asked us for help:
In a discussion I had today with someone about the probability puzzle of "one of my two children is a boy, what is the probability that my other child is a girl?" we got hung up on her (very strong) inference of "only one of my two children is a boy" from "one of my children is a boy". […]
She insisted that if one "takes the statement literally" that the statement necessarily has this ["one is" == "only one is"] meaning.
Read the rest of this entry »