| http://www.w3.org/ns/prov#value | - To save a bit of space I???ll use X to denote the event ???Mr Smith says, ???I have two children and at least one of them is a boy???.??? and I will write Y for ???Mr Smith says, ???I have two children and at least one of them is a girl???.??? In mathematical terms, my symmetry argument is that , even though we don???t know what either of these probabilities are.
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