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Mirrors > Home > MPE Home > Th. List > ndmfvrcl | Structured version Visualization version GIF version |
Description: Reverse closure law for function with the empty set not in its domain. (Contributed by NM, 26-Apr-1996.) |
Ref | Expression |
---|---|
ndmfvrcl.1 | ⊢ dom 𝐹 = 𝑆 |
ndmfvrcl.2 | ⊢ ¬ ∅ ∈ 𝑆 |
Ref | Expression |
---|---|
ndmfvrcl | ⊢ ((𝐹‘𝐴) ∈ 𝑆 → 𝐴 ∈ 𝑆) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ndmfvrcl.2 | . . . 4 ⊢ ¬ ∅ ∈ 𝑆 | |
2 | ndmfv 6128 | . . . . 5 ⊢ (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅) | |
3 | 2 | eleq1d 2672 | . . . 4 ⊢ (¬ 𝐴 ∈ dom 𝐹 → ((𝐹‘𝐴) ∈ 𝑆 ↔ ∅ ∈ 𝑆)) |
4 | 1, 3 | mtbiri 316 | . . 3 ⊢ (¬ 𝐴 ∈ dom 𝐹 → ¬ (𝐹‘𝐴) ∈ 𝑆) |
5 | 4 | con4i 112 | . 2 ⊢ ((𝐹‘𝐴) ∈ 𝑆 → 𝐴 ∈ dom 𝐹) |
6 | ndmfvrcl.1 | . 2 ⊢ dom 𝐹 = 𝑆 | |
7 | 5, 6 | syl6eleq 2698 | 1 ⊢ ((𝐹‘𝐴) ∈ 𝑆 → 𝐴 ∈ 𝑆) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1475 ∈ wcel 1977 ∅c0 3874 dom cdm 5038 ‘cfv 5804 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-nul 4717 ax-pow 4769 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-dm 5048 df-iota 5768 df-fv 5812 |
This theorem is referenced by: lterpq 9671 ltrnq 9680 reclem2pr 9749 msrrcl 30694 |
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