Question about "Nor" in Conditional Reasoning

duck24
Posts: 7
Joined: Sun Aug 14, 2011 12:59 pm

Question about "Nor" in Conditional Reasoning

Postby duck24 » Wed Nov 30, 2011 12:38 pm

I keep confusing myself about how the word nor operates in conditional reasoning. If someone could explain it to me, that would be so helpful! I feel like I want to treat the "nor" like "and" and then use "or" in the contrapositive, but I think treating it like "or" is correct?

Example: "If T volunteers, then neither Felicia nor Veena volunteers"

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20130312
Posts: 3842
Joined: Wed Nov 09, 2011 8:53 pm

Re: Question about "Nor" in Conditional Reasoning

Postby 20130312 » Wed Nov 30, 2011 12:39 pm

If T, then not F AND not V
CP: If F or V, then not T

ETA: Formal logic symbols

T ⇒ ~F & ~V
F ∨ V ⇒ ~T
Last edited by 20130312 on Wed Nov 30, 2011 12:44 pm, edited 1 time in total.

kaiser
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Joined: Mon May 09, 2011 11:34 pm

Re: Question about "Nor" in Conditional Reasoning

Postby kaiser » Wed Nov 30, 2011 12:44 pm

Nor is just a way of saying "and" when the factors are both negatives (i.e. that something will NOT happen)

Always works out to this:

If A --> NOT B and NOT C




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