The author uses the word "immediacy" (line 39) most likely in order to express
txcwbyon February 4, 2019
I am so lost
I am so lost on these. I have watched the video repeatedly and can grasp the concepts that are spoken about in the video about how to negotiate the sufficient and necessary conditions. However, during the homework flash cards I have yet to solve how the order is done. Can someone explain how they come up with the order?
P: NC - NX X - C
P:
C: X - ND D - NX
I solved this by laying the answer out as: d-nx -c so the answer I came up with for the second P: is NC - X.
The answer that the card shows is D - NC. Can someone show me where I keep going wrong?
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I'm not following which question on the homework/flashcards you're referring to in your message. Could you let me know which question it is? I know you wrote down some of it in your message, but I'm unable to understand because I don't see any arrows in what you wrote. If you could point me to the specific question you're referring to, I'd be happy to help you out.
Thanks!
txcwbyon February 5, 2019
sorry it is flash card 1 of 17 on missing premise drills
Ravion February 9, 2019
@txcwby,
Thanks. I'm happy to go through this with you.
We have
P: not C - >not X P: C: X - >not D
not C - >not X can also be written as X - >C
The conclusion can also be written as D - >not X
P: not C - >not X (X - >C) P: C: X - >not D (D - >not X)
Notice that not D first appears in the conclusion. It helps for us to also have the contrapositives for what we've been given because we need to be able to see how we can link everything together to make a conditional chain.
We have X - >C in the first premise and X - >not D in the conclusion. How can we go from
X - ->C
and conclude X - >not D?
We need a link between C and not D
If we add C - >not D, then we have
X - >C
C - >not D
Conclusion: X - >not D since X - >C - >not D
Does this make sense? The key is to try and think of how you can make everything fit into one nice, pretty chain so that the premises flow directly to the conclusion.
