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Mirrors > Home > MPE Home > Th. List > sbc2ie | Structured version Visualization version GIF version |
Description: Conversion of implicit substitution to explicit class substitution. (Contributed by NM, 16-Dec-2008.) (Revised by Mario Carneiro, 19-Dec-2013.) |
Ref | Expression |
---|---|
sbc2ie.1 | ⊢ 𝐴 ∈ V |
sbc2ie.2 | ⊢ 𝐵 ∈ V |
sbc2ie.3 | ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓)) |
Ref | Expression |
---|---|
sbc2ie | ⊢ ([𝐴 / 𝑥][𝐵 / 𝑦]𝜑 ↔ 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbc2ie.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | sbc2ie.2 | . 2 ⊢ 𝐵 ∈ V | |
3 | nfv 2015 | . . 3 ⊢ Ⅎ𝑥𝜓 | |
4 | nfv 2015 | . . 3 ⊢ Ⅎ𝑦𝜓 | |
5 | 2 | nfth 1902 | . . 3 ⊢ Ⅎ𝑥 𝐵 ∈ V |
6 | sbc2ie.3 | . . 3 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓)) | |
7 | 3, 4, 5, 6 | sbc2iegf 3729 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → ([𝐴 / 𝑥][𝐵 / 𝑦]𝜑 ↔ 𝜓)) |
8 | 1, 2, 7 | mp2an 685 | 1 ⊢ ([𝐴 / 𝑥][𝐵 / 𝑦]𝜑 ↔ 𝜓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 198 ∧ wa 386 = wceq 1658 ∈ wcel 2166 Vcvv 3414 [wsbc 3662 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1896 ax-4 1910 ax-5 2011 ax-6 2077 ax-7 2114 ax-9 2175 ax-10 2194 ax-12 2222 ax-ext 2803 |
This theorem depends on definitions: df-bi 199 df-an 387 df-or 881 df-3an 1115 df-tru 1662 df-ex 1881 df-nf 1885 df-sb 2070 df-clab 2812 df-cleq 2818 df-clel 2821 df-v 3416 df-sbc 3663 |
This theorem is referenced by: sbc3ie 3732 brfi1uzind 13569 opfi1uzind 13572 wrd2ind 13814 wrd2indOLD 13815 isprs 17283 isdrs 17287 istos 17388 issrg 18861 isslmd 30300 rexrabdioph 38202 rmydioph 38424 rmxdioph 38426 expdiophlem2 38432 |
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