作者sindarin5566 (sindarin家族)
看板Philo-08
标题[课堂] 基本逻辑
时间Fri Sep 19 00:13:16 2008
大家好,虽然我是5566,但是读逻辑的热情绝对不会输给各位。
首先,是关於Consistency和Validity的问题,
我作梦梦到,在今天的补救课程中,有些人分不清楚sentence和argument的区别,
而sentence和argument又和consistency和validity有相当大的关系,
在此就一并说明。
首先,区分两个问题:
Is such and such a set of beliefs or sentences consistent?
Is such and such an argument valid?
看的出sentence和argument哪里不同了吗?
For a set of sentences to be consistent, there must be a model for
all the sentences to be true.
For a set of sentences to be inconsistent, there must be no model for all the
sentences to be true.
A valid argument is one which when all the premises are true, the conclusion
must not be false.
如果还需要更清楚的例子与分析,请见以下网址:
http://logic.philosophy.ox.ac.uk/tutorial1/tut1-01.htm
http://logic.philosophy.ox.ac.uk/tutorial1/Tut1-07.htm
祝大家写作业顺利。
加入56,就是现在!
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