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Capítulo 8<br />
Ejercicios<br />
8.1. Igualdad, Inclusión y Conjunto vacío<br />
Demuéstrese los siguientes teoremas <strong>de</strong> ZF.<br />
1. ¬∀AB ((A ⊆ B) ∨ (B ⊆ A))<br />
2. ∀A ((A ⊆∅) ↔ (A = ∅))<br />
3. ¬∀AB ((A ⊆ B) → (B ⊆ A))<br />
4. ¬∀AB ((A ⊆ B) → (¬(B ⊆ A)))<br />
5. ∀ABC (((A ⊆ B) ∧ (B ⊂ C)) → (A ⊂ C))<br />
6. ∀A (¬( A ⊂ A))<br />
8.2. Operaciones: Algebra <strong>de</strong> conjuntos<br />
Pruébese las siguientes propieda<strong>de</strong>s en ZF.<br />
1. ∀ABC (((A ⊆ C) ∧ (B ⊆ C)) → ((A ∪ B) ⊆ C)))<br />
2. ∀ABC (((C ⊆ A) ∧ (C ⊆ B)) → (C ⊆ (A ∩ B)))<br />
3. ∀ABC ((A ∩ B) ∪ C =(A ∪ C) ∩ (B ∪ C))<br />
4. ∀ABC ((A ∪ B) ∩ C =(A ∩ C) ∪ (B ∩ C))<br />
5. ∀AB ((A − B) ∪ B = A ∪ B = A ∪ (B − A))<br />
6. ∀AB ((A − B) ∩ B = ∅)<br />
7. ∀ABC (A − (B ∩ C) =(A − B) ∪ (A − C))<br />
8. ∀ABC ((A ∪ B) − C =(A − C) ∪ (B − C))<br />
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