GIDEON ROSEN. I . The problem. Like most people, Ed does not believe in blue swans. However, he does believe that such creatures might have existed. That is, he believes such things are possible. Now according to the standard possible worlds account
GIDEON ROSEN. I . The problem. Like most people, Ed does not believe in blue swans. However, he does believe that such creatures might have existed. That is, he believes such things are possible. Now according to the standard possible worlds account