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I'm not able to move forward from step 4. I've tried Implication Introduction applied to 3 and 4 but nothing happens, any help is much appreciated.

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    I think you started in a good way. You can assume p(X) and use Implication Elimination to derive q(X). – F. Zer May 12 '20 at 23:22
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As F.Zer commented, before you can use Implication Introduction you must first make an assumption.

You must derive r(X) under the assumption of p(X), so that you may derive p(X) ⇒ r(X) by Implication Introduction.

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  • Thanks a lot guys, I followed those steps and figured it out. I'm leaving the answer here just in case it helps anyone. – Jessie The Pink Man May 13 '20 at 13:25
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enter image description here Final answer for this exercise is in the screenshot below.

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