| http://www.w3.org/ns/prov#value | - It seems that on A-theories this is a genuine property, and it was true in 1944 that Fred then had W and it is no longer true in 2008 that Fred has W. So it seems that Fred has changed in respect of W. The B-theorist is apt to deny the existence of such a property as W, and instead talk of the family of properties Wt of being (timelessly) in a world where a war is occurring at t.
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