{"id":23,"date":"2006-09-08T22:51:12","date_gmt":"2006-09-09T02:51:12","guid":{"rendered":"http:\/\/ling.bu.edu\/blog\/lx502f06\/2006\/09\/08\/hw1-part-3-is-completely-botched\/"},"modified":"2006-09-08T22:51:12","modified_gmt":"2006-09-09T02:51:12","slug":"hw1-part-3-is-completely-botched","status":"publish","type":"post","link":"http:\/\/ling-blogs.bu.edu\/lx502f06\/2006\/09\/08\/hw1-part-3-is-completely-botched\/","title":{"rendered":"HW1: Part 3 is completely botched"},"content":{"rendered":"

It seems I spent a bit too much time drawing cats and mats and a bit too little time proofreading on Homework 1. I was just trying to write up a key, and it turns out that Part 3 is wrong in a startlingly large number of ways.<\/p>\n

My suggestion: burn the copy of Homework 1 that I handed out (but only someplace safe), and download Homework 1 version 2.0<\/a> from the website.<\/p>\n

If you choose to soldier on with the one I handed out, here are the things that need to be changed:<\/p>\n

\n

→Reverse the meanings of p<\/em> and q<\/em>.<\/p>\n

Part 3<\/strong>: For convenience, let\u00e2\u20ac\u2122s label the sentences The door is open<\/em> as p<\/em> and The cat is on the mat<\/em> as q<\/em>. Using these labels, sentence (c) could be restated as “p<\/em> and q<\/em>.”<\/p>\n

→Change ¬p<\/em> to ¬q<\/em>.<\/p>\n

In logic, we use the symbol ¬ to mean “it is not the case that.” Thus, sentence (e) could be restated (using the labels above and the symbol) as “¬q<\/em>.” Similarly, the symbol ∧ corresponds to “and” (it looks a little bit like an “a”) and ∨ corresponds to “or” (it\u00e2\u20ac\u2122s not “and”). The “if…then” relation (implication) is represented by →, so sentence (d) can be written as “p<\/em>→q<\/em>“.<\/p>\n

→Change “sentence (b)” to “the sentence The door is not open<\/em>“.<\/p>\n

Question 3.3: Restate the sentence The door is not open<\/em> under the line in symbols.<\/p>\n<\/blockquote>\n

Great start to the semester! I guess it drives home the importance of reading the blog, but still I will try to proofread future homeworks a bit better.<\/p>\n","protected":false},"excerpt":{"rendered":"

It seems I spent a bit too much time drawing cats and mats and a bit too little time proofreading on Homework 1. I was just trying to write up a key, and it turns out that Part 3 is wrong in a startlingly large number of ways. My suggestion: burn the copy of Homework …<\/p>\n

Continue reading ‘HW1: Part 3 is completely botched’ »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,6],"tags":[],"class_list":["post-23","post","type-post","status-publish","format-standard","hentry","category-errata","category-homework-notes"],"_links":{"self":[{"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/posts\/23","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/comments?post=23"}],"version-history":[{"count":0,"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/posts\/23\/revisions"}],"wp:attachment":[{"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/media?parent=23"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/categories?post=23"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ling-blogs.bu.edu\/lx502f06\/wp-json\/wp\/v2\/tags?post=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}