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Mirrors > Home > MPE Home > Th. List > Mathboxes > wl-clelsb3df | Structured version Visualization version GIF version |
Description: Deduction version of clelsb3f 2960. (Contributed by Wolf Lammen, 29-May-2023.) |
Ref | Expression |
---|---|
clelsb3df.1 | ⊢ Ⅎ𝑦𝜑 |
clelsb3df.2 | ⊢ (𝜑 → Ⅎ𝑦𝐴) |
Ref | Expression |
---|---|
wl-clelsb3df | ⊢ (𝜑 → ([𝑥 / 𝑦]𝑦 ∈ 𝐴 ↔ 𝑥 ∈ 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfv 1915 | . . 3 ⊢ Ⅎ𝑤𝜑 | |
2 | clelsb3df.1 | . . 3 ⊢ Ⅎ𝑦𝜑 | |
3 | clelsb3df.2 | . . . 4 ⊢ (𝜑 → Ⅎ𝑦𝐴) | |
4 | 3 | nfcrd 2945 | . . 3 ⊢ (𝜑 → Ⅎ𝑦 𝑤 ∈ 𝐴) |
5 | 1, 2, 4 | sbco2d 2531 | . 2 ⊢ (𝜑 → ([𝑥 / 𝑦][𝑦 / 𝑤]𝑤 ∈ 𝐴 ↔ [𝑥 / 𝑤]𝑤 ∈ 𝐴)) |
6 | clelsb3 2917 | . . 3 ⊢ ([𝑦 / 𝑤]𝑤 ∈ 𝐴 ↔ 𝑦 ∈ 𝐴) | |
7 | 6 | sbbii 2081 | . 2 ⊢ ([𝑥 / 𝑦][𝑦 / 𝑤]𝑤 ∈ 𝐴 ↔ [𝑥 / 𝑦]𝑦 ∈ 𝐴) |
8 | clelsb3 2917 | . 2 ⊢ ([𝑥 / 𝑤]𝑤 ∈ 𝐴 ↔ 𝑥 ∈ 𝐴) | |
9 | 5, 7, 8 | 3bitr3g 316 | 1 ⊢ (𝜑 → ([𝑥 / 𝑦]𝑦 ∈ 𝐴 ↔ 𝑥 ∈ 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 Ⅎwnf 1785 [wsb 2069 ∈ wcel 2111 Ⅎwnfc 2936 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-10 2142 ax-11 2158 ax-12 2175 ax-13 2379 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-clel 2870 df-nfc 2938 |
This theorem is referenced by: wl-dfrabf 35029 |
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