Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > csbdm | Structured version Visualization version GIF version |
Description: Distribute proper substitution through the domain of a class. (Contributed by Alexander van der Vekens, 23-Jul-2017.) (Revised by NM, 24-Aug-2018.) |
Ref | Expression |
---|---|
csbdm | ⊢ ⦋𝐴 / 𝑥⦌dom 𝐵 = dom ⦋𝐴 / 𝑥⦌𝐵 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | csbab 4327 | . . 3 ⊢ ⦋𝐴 / 𝑥⦌{𝑦 ∣ ∃𝑤〈𝑦, 𝑤〉 ∈ 𝐵} = {𝑦 ∣ [𝐴 / 𝑥]∃𝑤〈𝑦, 𝑤〉 ∈ 𝐵} | |
2 | sbcex2 3743 | . . . . 5 ⊢ ([𝐴 / 𝑥]∃𝑤〈𝑦, 𝑤〉 ∈ 𝐵 ↔ ∃𝑤[𝐴 / 𝑥]〈𝑦, 𝑤〉 ∈ 𝐵) | |
3 | sbcel2 4305 | . . . . . 6 ⊢ ([𝐴 / 𝑥]〈𝑦, 𝑤〉 ∈ 𝐵 ↔ 〈𝑦, 𝑤〉 ∈ ⦋𝐴 / 𝑥⦌𝐵) | |
4 | 3 | exbii 1854 | . . . . 5 ⊢ (∃𝑤[𝐴 / 𝑥]〈𝑦, 𝑤〉 ∈ 𝐵 ↔ ∃𝑤〈𝑦, 𝑤〉 ∈ ⦋𝐴 / 𝑥⦌𝐵) |
5 | 2, 4 | bitri 278 | . . . 4 ⊢ ([𝐴 / 𝑥]∃𝑤〈𝑦, 𝑤〉 ∈ 𝐵 ↔ ∃𝑤〈𝑦, 𝑤〉 ∈ ⦋𝐴 / 𝑥⦌𝐵) |
6 | 5 | abbii 2803 | . . 3 ⊢ {𝑦 ∣ [𝐴 / 𝑥]∃𝑤〈𝑦, 𝑤〉 ∈ 𝐵} = {𝑦 ∣ ∃𝑤〈𝑦, 𝑤〉 ∈ ⦋𝐴 / 𝑥⦌𝐵} |
7 | 1, 6 | eqtri 2761 | . 2 ⊢ ⦋𝐴 / 𝑥⦌{𝑦 ∣ ∃𝑤〈𝑦, 𝑤〉 ∈ 𝐵} = {𝑦 ∣ ∃𝑤〈𝑦, 𝑤〉 ∈ ⦋𝐴 / 𝑥⦌𝐵} |
8 | dfdm3 5730 | . . 3 ⊢ dom 𝐵 = {𝑦 ∣ ∃𝑤〈𝑦, 𝑤〉 ∈ 𝐵} | |
9 | 8 | csbeq2i 3798 | . 2 ⊢ ⦋𝐴 / 𝑥⦌dom 𝐵 = ⦋𝐴 / 𝑥⦌{𝑦 ∣ ∃𝑤〈𝑦, 𝑤〉 ∈ 𝐵} |
10 | dfdm3 5730 | . 2 ⊢ dom ⦋𝐴 / 𝑥⦌𝐵 = {𝑦 ∣ ∃𝑤〈𝑦, 𝑤〉 ∈ ⦋𝐴 / 𝑥⦌𝐵} | |
11 | 7, 9, 10 | 3eqtr4i 2771 | 1 ⊢ ⦋𝐴 / 𝑥⦌dom 𝐵 = dom ⦋𝐴 / 𝑥⦌𝐵 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1542 ∃wex 1786 ∈ wcel 2114 {cab 2716 [wsbc 3680 ⦋csb 3790 〈cop 4522 dom cdm 5525 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2020 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2162 ax-12 2179 ax-ext 2710 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2075 df-clab 2717 df-cleq 2730 df-clel 2811 df-nfc 2881 df-v 3400 df-sbc 3681 df-csb 3791 df-dif 3846 df-nul 4212 df-br 5031 df-dm 5535 |
This theorem is referenced by: sbcfng 6501 |
Copyright terms: Public domain | W3C validator |