Timeline for Why is A implies B true if A is false and B is false?
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 28, 2016 at 3:48 | comment | added | eques | Something may be counterintuitive, but I'm not familiar with someone saying the "intuition is not actually true". Your example doesn't seem to express what you are trying to say. What "intuition" is the answer above "invoking"? | |
| Nov 28, 2016 at 1:57 | comment | added | user541686 | @eques: I feel like you guys missed what I'm trying to say. Read my comment again. I said "...until you realize the intuition it's invoking is actually not true". I'm talking about the intuition -- the intuition of "B is at least as true as A". I'm saying that even though it's true logically, it's not true intuitively. Given the entire point of that statement is to make an intuitive statement, I'm arguing that it's not very helpful. | |
| Nov 28, 2016 at 1:48 | comment | added | eques | @Mehrdad people say things that aren't logically rigorous all the time; that doesn't mean the rules of logic aren't good. And if someone still gets up in the morning even though the sun did not rise, they didn't counter their implication. The implication is still true | |
| Nov 28, 2016 at 0:00 | comment | added | user541686 | @eques: "If the sun rises tomorrow then I will get up in the morning"... I'd bet if the sun didn't rise tomorrow I'd still get up in the morning (barring other effects of the sun disappearing). But people say stuff like that anyway. | |
| Nov 27, 2016 at 23:44 | comment | added | Paŭlo Ebermann | @Mehrdad shouldn't that be "If I am an alien, then aliens roam Earth"? | |
| Nov 26, 2016 at 17:05 | comment | added | eques | "If aliens roam Earth then I am an alien" is not a true implication; that is, q does not follow from p ordinarily. That is distinct from if p is false the implication is true | |
| Nov 26, 2016 at 11:21 | comment | added | user541686 | That statement sounds nice until you realize the intuition it's invoking is actually not true. Think about something like "If aliens roam Earth then I am an alien"... I'd be much more inclined to believe that aliens roam Earth than that I myself am an alien... | |
| Nov 26, 2016 at 3:29 | review | First posts | |||
| Nov 26, 2016 at 3:56 | |||||
| Nov 26, 2016 at 3:27 | history | answered | Hatshepsut | CC BY-SA 3.0 |