Natural Deduction: Introduction to Mathematical Logic #3

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Excellent! Small feedback: calling the two reductio-ad-absurdum rules "negation introduction" clearly only makes sense for one of them. Sticking to calling them RAA seems more intuitive.

Urdatorn
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Is he writing backwards the whole time. How does he do this effect of writing behind the text?

GiriColnat
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I hope my ability will not fail in mathematical reasoning. Mathematical reasoning is not hard for me to get pass.

raindropsofsky
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Where is the comment?
in the Video spoken of?

sahilagrawal
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How to prove this
Prove: (M/W
1.(A->~A)
2.(A->W)
3.(~A->M)

And

Prove: (X/Z)
1. [(X/Z) → ~K]
2. [W → (C/~P)]
3. [(C/~P) → (X&W)]
4. { ~[~W / ~(X/Z)] / (X&~Z)}
5. {~ (X&W) / ~[(X/Z) & ~K]}

renzbandoquillo