Homework Help: Geometry (Logic)

Posted by Lisa on Tuesday, February 7, 2012 at 7:37pm.

Which argument is not valid?

1.) Given: a→b
a
Conclusion: b

2.) Given: a˅b
~b
Conclusion: ~a

3.) Given: a→b
~b
Conclusion: ~a

4.) Given: a→b
b→~c
Conclusion: a→~c

Geometry (Logic) - Steve, Wednesday, February 8, 2012 at 5:10am
#2 is not an argument, since there is no implication.

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