[Coursera] Think Again: How to Reason and Argue (Week 4,5,6)

[Coursera]Think Again: How to Reason and Argue #3 - 2014-01-13@Duke

进度贴 && 讨论帖 课程汇总 && 介绍：http://www.1point3acres.com/bbs/thread-81227-1-1.html Week #4,5,6任务： PART II: HOW TO EVALUATE DEDUCTIVE ARGUMENTS Week 4 (February 2 – 9): Propositional Logic and Truth Tables CONTENT: This week’s lectures will present propositional logic, which formalizes external relations between whole propositions or sentences in deductive arguments. Topics include negation (“not”), conjunction (“and”), disjunction (“or”), and conditionals (“if…, then …”). Students will learn to test arguments for validity using truth tables. READING: Understanding Arguments, Ninth Edition, Chapter 6 Week 5 (February 10 – 16): Categorical Logic and Syllogisms CONTENT: This week’s lectures will present categorical logic, which formalizes some deductive relations that depend on internal features of propositions or sentences in deductive arguments. Topics include the four basic categorical forms, contradictory and contrary propositions, existential commitment, immediate inferences, and syllogisms. Students will learn to test arguments for validity using Venn diagrams. READING: Understanding Arguments, Ninth Edition, Chapter 7 Week 6 (February 17 – 23): Representing Information CONTENT: This week’s lectures will discuss the different ways to represent information, and how different ways of representing information can be useful in helping us to understand why some deductive arguments are valid and other are invalid, even if we don't fully understand those arguments. Topics include a review of truth-tables, Venn diagrams, and the point of using these tools to represent information that can also be represented in sentences. QUIZ #2: At the end of Week 6, students will take their second quiz. 截图规范： 在Progress里面每次把（QUIZ #2: At the end of Week 6, students will take their second quiz. ）截图截下来 会有版主给大家加分，1学分（50大米）

那个。。。我想问下这个过期的话还可不可以答题了？开这学好多事情忙，好久没听这个课了。。。

Rebecca1217 发表于 2014-3-6 18:23
那个。。。我想问下这个过期的话还可不可以答题了？开这学好多事情忙，好久没听这个课了。。。

可以啊。。deadline在五月呐

这QUIZ2的难度比第一次大多了。。
主要是得得列真值表= =

有一题我还是不很明白
(d) All gerbils are purple.
_____________________
Therefore, some gerbils are purple.
这个怎么可能是invalid的？！
他的解释是如果没有gerbils（沙鼠），那么前提可能成立——所有沙鼠还可能都是紫色的（因为根本就没有沙鼠），但是结论就不成立了——因为根本没有沙鼠，说有沙鼠是紫色的就说明有沙鼠存在。
是这样吗？all→some 不必然吗？

qzwzkyssb9h 发表于 2014-3-6 18:34
可以啊。。deadline在五月呐

没有权限给您发消息，留言 泪 想咨询您电话面试消息，方便加下我的微信么。。c1211270356

Quiz 2 done.