{"id":4505,"date":"2018-05-22T11:34:15","date_gmt":"2018-05-22T11:34:15","guid":{"rendered":"https:\/\/maverickphilosopher.blog\/index.php\/2018\/05\/22\/does-the-validity-of-an-argument-depend-on-the-order-of-its-premises\/"},"modified":"2018-05-22T11:34:15","modified_gmt":"2018-05-22T11:34:15","slug":"does-the-validity-of-an-argument-depend-on-the-order-of-its-premises","status":"publish","type":"post","link":"https:\/\/maverickphilosopher.blog\/index.php\/2018\/05\/22\/does-the-validity-of-an-argument-depend-on-the-order-of-its-premises\/","title":{"rendered":"Does the Validity of an Argument Depend on the Order of its Premises?"},"content":{"rendered":"

Suppose you have a valid argument. Can you render the argument invalid by changing the display order of the premises?<\/span><\/p>\n

I should think never. The Dark Ostrich, however, offers the following putative counterexample. He says he got it from Sainsbury; I should like to see a reference.  And if there is a literature on this, I should like to see a bibliography.<\/span><\/p>\n

\n

(A) Some Greek is called \u2018Mark\u2019, Mark is an evangelist, therefore some Greek is an evangelist. (VALID)<\/span><\/p>\n

(B) Mark is an evangelist, some Greek is called \u2018Mark\u2019, therefore some Greek is an evangelist. (NOT VALID)<\/span><\/p>\n<\/blockquote>\n

(A) is valid and (B) is not. But this is not evidence that premise order affects validity. For while the sentences<\/em> are the same, the premises<\/em> of the two arguments are not the same.  Made explicit, (A) becomes<\/span><\/p>\n

\n

(A*) Some Greek is called 'Mark', this same individual called 'Mark is an evangelist, therefore some Greek is an evangelist.<\/span><\/p>\n<\/blockquote>\n

Clearly, (A*) and (B) have different premises. So it is not the different order of the premises in (B) that causes it to be invalid.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Suppose you have a valid argument. Can you render the argument invalid by changing the display order of the premises? I should think never. The Dark Ostrich, however, offers the following putative counterexample. He says he got it from Sainsbury; I should like to see a reference.  And if there is a literature on this, … Continue reading “Does the Validity of an Argument Depend on the Order of its Premises?”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[408,108],"tags":[],"class_list":["post-4505","post","type-post","status-publish","format-standard","hentry","category-language-philosophy-of","category-logica-docens"],"_links":{"self":[{"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/posts\/4505","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/comments?post=4505"}],"version-history":[{"count":0,"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/posts\/4505\/revisions"}],"wp:attachment":[{"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/media?parent=4505"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/categories?post=4505"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/maverickphilosopher.blog\/index.php\/wp-json\/wp\/v2\/tags?post=4505"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}