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On behalf of the general audience, I have replaced the misleading and confusing expression "just in case", with its correct, and easily understood equivalent, " if, and only if" (also, in more technical writing, "if and only if"). The following explains the error:

• Language Log: "Just in Case"
• Southern California Philosophy for philosophy graduate students: "Just in Case". Dr Lindsay B Yeates ( talk) 21:27, 9 April 2014 (UTC) reply

Is there a problem with the definition of truth function or truth functional? I mean the first sentence says that a truth function gives a truth output value from a truth input value, but later says about propositional logic, propositional logic gives one truth value, which is either truth or false. Is that not contradictory definition??? — Preceding unsigned comment added by Josemazcorro ( talk • contribs) 11:55, 17 March 2019 (UTC) reply