Soit E et F deux ensembles. Coche les bonnes réponses.
x ∈ E ∪ F x in E union F ⟺ x ∈ E x in E ou x ∈ F x in F .
x ∈ E ∪ F x in E union F ⟺ x ∈ E x in E et x ∈ F x in F .
x ∈ E ∩ F x in E intersection F ⟺ x ∈ E x in E ou x ∈ F x in F .
x ∈ E ∩ F x in E intersection F ⟺ x ∈ E x in E et x ∈ F x in F .