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FormalLogician

Joined 18 October 2010

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A => B is equivalent to ~B => ~A

Retrieved from "https://en.wikipedia.org/w/index.php?title=User:FormalLogician&oldid=391402002"

Last edited on 18 October 2010, at 08:39

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This page was last edited on 18 October 2010, at 08:39 (UTC).
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