ext_83566 ([identity profile] pozorvlak.livejournal.com) wrote in [personal profile] pozorvlak 2011-06-21 08:58 am (UTC)

Precisely. From my post:
the statement "if X then Y" is equivalent to its contrapositive, "if not-Y then not-X".
It may help at this point to draw a truth-table.
(16 comments)

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