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For example, "I heard [[thunder]]" is a sufficient condition of "There was lightning nearby," because if I heard thunder, there ''must'' have been [[lightning]] nearby to cause it.
For example, "I heard [[thunder]]" is a sufficient condition of "There was lightning nearby," because if I heard thunder, there ''must'' have been [[lightning]] nearby to cause it.
However, "There was lightning nearby" is ''not'' a sufficient cause of "I heard thunder," because there may have been lightning nearby that I did not hear.
However, "There was lightning nearby" is ''not'' a sufficient cause of "I heard thunder," because there may have been lightning nearby that I did not hear.
From the affirmation of a sufficient condition, one may infer that the [[necessary condition]] is true.
[[Category:Logic]]
[[Category:Logic]]