Difference between revisions of "Sufficient condition"
Jump to navigation
Jump to search
| Line 8: | Line 8: | ||
[[Category:Logic]] | [[Category:Logic]] | ||
| + | |||
| + | ==See Also== | ||
| + | [[Modus ponens]] | ||
| + | |||
| + | [[Modus tollens]] | ||
Revision as of 11:12, October 26, 2013
A sufficient condition is one for which the following is true:
- If A is a sufficient condition of B, then if A is true, B must be true.
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.
From the affirmation of a sufficient condition, one may infer that the necessary condition is true.