tag:blogger.com,1999:blog-3197113715525875863.post1033321379289732432..comments2024-03-29T14:05:03.200-07:00Comments on Et in Arcadia Ego: Confirming the ConsequentUnknownnoreply@blogger.comBlogger5125tag:blogger.com,1999:blog-3197113715525875863.post-70436038246286368062011-07-01T01:18:31.073-07:002011-07-01T01:18:31.073-07:00why not:)why not:)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3197113715525875863.post-36107062983777696532011-03-31T00:34:20.757-07:002011-03-31T00:34:20.757-07:00Leo Bushkin, thanks for the comment.
You're e...Leo Bushkin, thanks for the comment.<br /><br />You're exactly correct. If we have an argument in the form of "If and only if P, then Q" and we assert Q, then we can logically conclude P. BTW: I like to abbreviate the somewhat cumbersome phrase 'if and only if' as 'iff', pronounced 'ifef'<br /><br />In a bastard ASCII mockery of formal notation, we'll call your argument:<br /><br />1) P <=> Q<br />2) Q<br />ergo 3) P<br /><br />This is perfectly valid. This is also not quite confirming the consequent. Confirming the consequent is a fallacy when used on the somewhat simpler conditional 'if' rather than iff. In our bastard ASCII, we notate confirming the consequent as:<br /><br />1) P => Q<br />2) Q<br />ergo 3)P<br /><br />which is not a valid argument form.<br /><br />Which reminds me, to continue my discussion of logical fallacies and errors of reasoning. Your comment could well use an additional explanation of necessary and sufficient conditions.Lord Carnifexhttps://www.blogger.com/profile/03370336507698082907noreply@blogger.comtag:blogger.com,1999:blog-3197113715525875863.post-43977211160244544982011-03-31T00:08:33.359-07:002011-03-31T00:08:33.359-07:00There are cases where affirming the consequent is ...There are cases where affirming the consequent is not a logical fallacy. When the argument is structured: If and only if P the Q, Q therefore P. For example: "If and only if the cake is chocolate will Henry eat a cake. Henry is eating a cake, therefore the cake is chocolate."Leo Bushkinhttps://www.blogger.com/profile/08042967841611979113noreply@blogger.comtag:blogger.com,1999:blog-3197113715525875863.post-11558430233291077872011-02-17T02:00:43.789-08:002011-02-17T02:00:43.789-08:00Conseils tres interessants. A quand la suite?Conseils tres interessants. A quand la suite?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3197113715525875863.post-71631411794343411122010-02-20T07:19:42.425-08:002010-02-20T07:19:42.425-08:00You have to express more your opinion to attract m...You have to express more your opinion to attract more readers, because just a video or plain text without any personal approach is not that valuable. But it is just form my point of viewAnonymousnoreply@blogger.com