Math Fundamentals18 sections · 814 units
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De Morgan's Laws

Complement identities

De Morgan's laws relate complements to union and intersection:

1.1. (A∪B)c=Ac∩Bc(A \cup B)^c = A^c \cap B^c

2.2. (A∩B)c=Ac∪Bc(A \cap B)^c = A^c \cup B^c

These laws let you rewrite expressions involving complements. For example, the complement of a union equals the intersection of complements.