{"id":40145,"date":"2020-09-16T04:23:22","date_gmt":"2020-09-16T04:23:22","guid":{"rendered":"https:\/\/www.oracletutoring.ca\/blog\/?p=40145"},"modified":"2020-09-16T04:23:22","modified_gmt":"2020-09-16T04:23:22","slug":"math-set-subtraction","status":"publish","type":"post","link":"https:\/\/www.oracletutoring.ca\/blog\/math-set-subtraction\/","title":{"rendered":"Math: set subtraction"},"content":{"rendered":"\n<h2>Tutoring math, ideas can always be revisited. The tutor mentions set subtraction.<\/h2>\n<p>Set subtraction is different from arithmetic subtraction. If A and B are sets, the operation A-B ignores what&#8217;s in B only; it just gives back what&#8217;s present in A yet absent in B.\n<p>Therefore, if A={M,N,Q} and B={Q,T,X,Z}, A-B is {M,N}. Furthermore, if B={Q,T,X,Z,1,2,3,4,5}, A-B remains {M,N}.<\/p>\n<p>Kind of interesting, eh?<\/p>\n<p>Source:<\/p>\n<p>Connolly, Thomas M. and Carolyn E. Begg. <em>Database Systems<\/em>. Toronto: Pearson, 2015.<\/p>\nJack of <a href=\"https:\/\/www.oracletutoring.ca\">Oracle Tutoring by Jack and Diane,<\/a> Campbell River, BC.\n","protected":false},"excerpt":{"rendered":"<p>Tutoring math, ideas can always be revisited. The tutor mentions set subtraction. Set subtraction is different from arithmetic subtraction. If A and B are sets, the operation A-B ignores what&#8217;s in B only; it just gives back what&#8217;s present in &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"more-link\" href=\"https:\/\/www.oracletutoring.ca\/blog\/math-set-subtraction\/\"> <span class=\"screen-reader-text\">Math: set subtraction<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-40145","post","type-post","status-publish","format-standard","hentry","category-math"],"_links":{"self":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/40145","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/comments?post=40145"}],"version-history":[{"count":2,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/40145\/revisions"}],"predecessor-version":[{"id":40147,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/40145\/revisions\/40147"}],"wp:attachment":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/media?parent=40145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/categories?post=40145"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/tags?post=40145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}