Conjuntos - DIM
Conjuntos - DIM
Conjuntos - DIM
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<strong>Conjuntos</strong><br />
Diferencia simétrica<br />
Semana02[17/23]<br />
Obviamente, algunas propiedades:<br />
Propiedades<br />
Sean A, B, C conjuntos.<br />
1 A∆B = (A ∪ B) \ (A ∩ B)<br />
2 A∆B = B∆A<br />
3 (A∆B)∆C = A∆(B∆C)<br />
4 A∆A = φ<br />
5 A∆φ = A<br />
6 (A ∩ (B∆C)) = (A ∩ B)∆(A ∩ C)<br />
Demostración.<br />
Demostraremos la primera.<br />
A∆B = (A \ B) ∪ (B \ A)<br />
= (A ∩ B c ) ∪ (B ∩ A c )<br />
= [(A ∩ B c ) ∪ B] ∩ [(A ∩ B c ) ∪ A c ]<br />
= [(A ∪ B) ∩ (B c ∪ B)] ∩ [(A ∪ A c ) ∩ (B c ∪ A c )]<br />
= [(A ∪ B) ∩ U] ∩ [U ∩ (B c ∪ A c )]<br />
= (A ∪ B) ∩ (B c ∪ A c )<br />
= (A ∪ B) ∩ (B ∩ A) c<br />
= (A ∪ B) \ (A ∩ B).<br />
<strong>Conjuntos</strong>