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Conjuntos - DIM

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<strong>Conjuntos</strong><br />

Diferencia y complemento<br />

Semana02[15/23]<br />

Algunas propiedades:<br />

Propiedades<br />

Sean A y B conjuntos.<br />

1 Leyes de De Morgan<br />

1.1. (A ∪ B) c = A c ∩ B c<br />

1.2. (A ∩ B) c = A c ∪ B c<br />

2 (A ⊆ B) ⇐⇒ (B c ⊆ A c )<br />

3 (A c ) c = A<br />

4 A ∪ A c = U<br />

5 A ∩ A c = φ<br />

Demostración.<br />

Demostraremos la primera. Sea x arbitrario.<br />

x ∈ (A ∪ B) c ⇐⇒ x ∈ (A ∪ B)<br />

⇐⇒ (x ∈ A) ∨ (x ∈ B)<br />

⇐⇒ (x ∈ A) ∧ (x ∈ B)<br />

⇐⇒ (x ∈ A c ) ∧ (x ∈ B c )<br />

⇐⇒ x ∈ (A c ∩ B c )<br />

<strong>Conjuntos</strong>

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