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Please could someone clarify about exam 2017.02.15 problem 1.b as following:

The red highlighted step should not be  Ⱶ !d&b ?

Since in exercise solution sheet we have as below:

Thanks in advance.

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The solution is correct. Where did you get this table from? It is fixed in the new version of the exercise slides: (slide 20)

You can also derive this rule on your own as a→b = ¬a ∨ b.

See also lecture slide 96

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