SSH 105 Lecture : Chapter 3_Notes_part_2.docx
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22 Oct 2012
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Chapter 3 - part 2 sufficient reason. Critical thinking demand that we have acceptable and sufficient reasons for our beliefs and decisions: our reasons should be true, they support the conclusion. These two conditions are completely independent of one another. An argument is valid if and only if it is not possible for the premises to be true and the conclusion is false. An argument is invalid if and only if it is not valid. Note: this is a special use of the word valid". In critical thinking, the word only applies to arguments; not to premises or conclusions. If yes, then the argument is not valid. Remember, a valid argument need not have true premises, and it need not have a true conclusion: What"s important is the logical relationship between the premise(s) and the conclusion(s). If an argument is not valid, then it is not a good argument.
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