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Mirrors > Home > MPE Home > Th. List > cbvral3vw | Structured version Visualization version GIF version |
Description: Change bound variables of triple restricted universal quantification, using implicit substitution. Version of cbvral3v 3342 with a disjoint variable condition, which does not require ax-13 2371. (Contributed by NM, 10-May-2005.) Avoid ax-13 2371. (Revised by Gino Giotto, 10-Jan-2024.) |
Ref | Expression |
---|---|
cbvral3vw.1 | ⊢ (𝑥 = 𝑤 → (𝜑 ↔ 𝜒)) |
cbvral3vw.2 | ⊢ (𝑦 = 𝑣 → (𝜒 ↔ 𝜃)) |
cbvral3vw.3 | ⊢ (𝑧 = 𝑢 → (𝜃 ↔ 𝜓)) |
Ref | Expression |
---|---|
cbvral3vw | ⊢ (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐶 𝜑 ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ∀𝑢 ∈ 𝐶 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cbvral3vw.1 | . . . 4 ⊢ (𝑥 = 𝑤 → (𝜑 ↔ 𝜒)) | |
2 | 1 | 2ralbidv 3209 | . . 3 ⊢ (𝑥 = 𝑤 → (∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐶 𝜑 ↔ ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐶 𝜒)) |
3 | 2 | cbvralvw 3224 | . 2 ⊢ (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐶 𝜑 ↔ ∀𝑤 ∈ 𝐴 ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐶 𝜒) |
4 | cbvral3vw.2 | . . . 4 ⊢ (𝑦 = 𝑣 → (𝜒 ↔ 𝜃)) | |
5 | cbvral3vw.3 | . . . 4 ⊢ (𝑧 = 𝑢 → (𝜃 ↔ 𝜓)) | |
6 | 4, 5 | cbvral2vw 3226 | . . 3 ⊢ (∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐶 𝜒 ↔ ∀𝑣 ∈ 𝐵 ∀𝑢 ∈ 𝐶 𝜓) |
7 | 6 | ralbii 3093 | . 2 ⊢ (∀𝑤 ∈ 𝐴 ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐶 𝜒 ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ∀𝑢 ∈ 𝐶 𝜓) |
8 | 3, 7 | bitri 275 | 1 ⊢ (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐶 𝜑 ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ∀𝑢 ∈ 𝐶 𝜓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∀wral 3061 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 |
This theorem depends on definitions: df-bi 206 df-an 398 df-ex 1783 df-clel 2811 df-ral 3062 |
This theorem is referenced by: latdisd 18391 addsprop 27310 dffltz 41015 isthincd2lem2 47142 |
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