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This definition is hilarious. A thing (an impossible world) is exactly the same thing as something else (a possible world), except that it is different. — Preceding unsigned comment added by 198.72.191.171 ( talk) 06:10, 8 February 2013 (UTC) reply

there is exactly 4 kinds of impossible worlds and non-normal is only a part of this, please rewrite the whole thing because it only talks about non-normal worlds which only deals with logic but impossible worlds are not only about logic, thanks. — Preceding unsigned comment added by 178.143.178.204 ( talk) 11:57, 20 January 2017 (UTC) reply