Joined: April 19, 2009  (email not validated)

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Re: I didn’t sleep last night AND the night before  •  April 19, 2009, 6:48am  •  1 vote

In logic, "not (A or B)" is the same as "(not A) and (not B)" Similarly, "not (A and B)" is the same as "(not A) or (not B)" You can apply these De Morgan laws to English sentences. But first,