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Problem Let A = { 1 , 2 , { 3 , 4 } , 5 } A = \{1, 2, \{3, 4\}, 5\} A = { 1 , 2 , { 3 , 4 } , 5 } { 3 , 4 } ⊂ A \{3, 4\} \subset A { 3 , 4 } ⊂ A { 3 , 4 } ∈ A \{3, 4\} \in A { 3 , 4 } ∈ A { { 3 , 4 } } ⊂ A \{\{3, 4\}\} \subset A {{ 3 , 4 }} ⊂ A 1 ∈ A 1 \in A 1 ∈ A 1 ⊂ A 1 \subset A 1 ⊂ A { 1 , 2 , 5 } ⊂ A \{1, 2, 5\} \subset A { 1 , 2 , 5 } ⊂ A { 1 , 2 , 5 } ∈ A \{1, 2, 5\} \in A { 1 , 2 , 5 } ∈ A { 1 , 2 , 3 } ⊂ A \{1, 2, 3\} \subset A { 1 , 2 , 3 } ⊂ A ϕ ∈ A \phi \in A ϕ ∈ A ϕ ⊂ A \phi \subset A ϕ ⊂ A { ϕ } ⊂ A \{\phi\} \subset A { ϕ } ⊂ A Browse the problem library