n cazul unui enunţ compus, alcătuit din două afirmaţii (judecăţi) simple A şi B, legile pot fi scrise astfel:

Legile lui De Morgan.PNG

\neg(p\lor q)\iff(\neg p)\land(\neg q)
\neg(p\land q)\iff(\neg p)\lor(\neg q)

\overline{\bigcap_{i \in I} A_{i}}=\bigcup_{i \in I} \overline{A_{i}}
\overline{\bigcup_{i \in I} A_{i}}=\bigcap_{i \in I} \overline{A_{i}}

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