http://en.iwschool.org/wiki/index.php?title=Logic/Necessity_and_sufficiency&action=history Revision history for this page on the wiki en MediaWiki 1.15.4 Sat, 18 Apr 2026 09:31:33 GMT http://en.iwschool.org/wiki/index.php?title=Logic/Necessity_and_sufficiency&diff=3340&oldid=prev <p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 08:36, 23 May 2014</td> </tr> <tr><td colspan="2" class="diff-lineno">Line 6:</td> <td colspan="2" class="diff-lineno">Line 6:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[wikipedia:Propositional_calculus|Propositional calculus]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[wikipedia:Propositional_calculus|Propositional calculus]]</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[wikipedia:Necessary_and_sufficient_conditions|Necessary and sufficient conditions]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[wikipedia:Necessary_and_sufficient_conditions|Necessary and sufficient conditions]]</div></td></tr> <tr><td colspan="2">&nbsp;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&nbsp;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">== Overview ==</ins></div></td></tr> <tr><td colspan="2">&nbsp;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&nbsp;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Necessary : If &quot;α→β&quot; then &quot;β is necessary for α&quot;.</ins></div></td></tr> <tr><td colspan="2">&nbsp;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Sufficient : If &quot;α→β&quot; then &quot;α is sufficient for β&quot;.</ins></div></td></tr> <tr><td colspan="2">&nbsp;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Necessary and sufficient : If &quot;α⇔β&quot; then &quot;α is necessary and sufficient for β&quot;.</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== CAI Exercise ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== CAI Exercise ==</div></td></tr> <!-- diff generator: internal 2026-04-18 09:31:33 --> </table> Fri, 23 May 2014 08:36:36 GMT Admin http://en.iwschool.org/wiki/Talk:Logic/Necessity_and_sufficiency http://en.iwschool.org/wiki/index.php?title=Logic/Necessity_and_sufficiency&diff=3324&oldid=prev <p>Created page with &#39;<a href="/wiki/Logic" title="Logic">Logic</a> &gt; Necessity and sufficiency == Contents == * <a href="http://en.wikipedia.org/wiki/Category:Mathematical_logic" class="extiw" title="wikipedia:Category:Mathematical logic">Category:Mathematical logic（Wikipedia）</a> * [[wikipedia:Propositional_calcul…&#39;</p> <p><b>New page</b></p><div>[[Logic]] &gt; Necessity and sufficiency<br /> <br /> == Contents ==<br /> <br /> * [[wikipedia:Category:Mathematical logic|Category:Mathematical logic（Wikipedia）]] <br /> * [[wikipedia:Propositional_calculus|Propositional calculus]]<br /> * [[wikipedia:Necessary_and_sufficient_conditions|Necessary and sufficient conditions]]<br /> <br /> == CAI Exercise ==<br /> <br /> *[[cai_en:EDULOG00010008|Go to CAI Exercise page]]<br /> <br /> <br /> <br /> [[en:Logic/Necessity and sufficiency]]<br /> [[ja:論理学/必要条件と十分条件]]</div> Fri, 23 May 2014 04:28:59 GMT Admin http://en.iwschool.org/wiki/Talk:Logic/Necessity_and_sufficiency