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Mirrors > Home > MPE Home > Th. List > elfzoelz | Structured version Visualization version GIF version |
Description: Reverse closure for half-open integer sets. (Contributed by Stefan O'Rear, 14-Aug-2015.) |
Ref | Expression |
---|---|
elfzoelz | ⊢ (𝐴 ∈ (𝐵..^𝐶) → 𝐴 ∈ ℤ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elfzoel1 13385 | . . . 4 ⊢ (𝐴 ∈ (𝐵..^𝐶) → 𝐵 ∈ ℤ) | |
2 | elfzoel2 13386 | . . . 4 ⊢ (𝐴 ∈ (𝐵..^𝐶) → 𝐶 ∈ ℤ) | |
3 | fzof 13384 | . . . . 5 ⊢ ..^:(ℤ × ℤ)⟶𝒫 ℤ | |
4 | 3 | fovcl 7402 | . . . 4 ⊢ ((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) → (𝐵..^𝐶) ∈ 𝒫 ℤ) |
5 | 1, 2, 4 | syl2anc 584 | . . 3 ⊢ (𝐴 ∈ (𝐵..^𝐶) → (𝐵..^𝐶) ∈ 𝒫 ℤ) |
6 | 5 | elpwid 4544 | . 2 ⊢ (𝐴 ∈ (𝐵..^𝐶) → (𝐵..^𝐶) ⊆ ℤ) |
7 | id 22 | . 2 ⊢ (𝐴 ∈ (𝐵..^𝐶) → 𝐴 ∈ (𝐵..^𝐶)) | |
8 | 6, 7 | sseldd 3922 | 1 ⊢ (𝐴 ∈ (𝐵..^𝐶) → 𝐴 ∈ ℤ) |
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