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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-2upleq | Structured version Visualization version GIF version |
Description: Substitution property for ⦅ − , − ⦆. (Contributed by BJ, 6-Oct-2018.) |
Ref | Expression |
---|---|
bj-2upleq | ⊢ (𝐴 = 𝐵 → (𝐶 = 𝐷 → ⦅𝐴, 𝐶⦆ = ⦅𝐵, 𝐷⦆)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-1upleq 35875 | . . 3 ⊢ (𝐴 = 𝐵 → ⦅𝐴⦆ = ⦅𝐵⦆) | |
2 | bj-xtageq 35864 | . . 3 ⊢ (𝐶 = 𝐷 → ({1o} × tag 𝐶) = ({1o} × tag 𝐷)) | |
3 | uneq12 4158 | . . . 4 ⊢ ((⦅𝐴⦆ = ⦅𝐵⦆ ∧ ({1o} × tag 𝐶) = ({1o} × tag 𝐷)) → (⦅𝐴⦆ ∪ ({1o} × tag 𝐶)) = (⦅𝐵⦆ ∪ ({1o} × tag 𝐷))) | |
4 | 3 | ex 413 | . . 3 ⊢ (⦅𝐴⦆ = ⦅𝐵⦆ → (({1o} × tag 𝐶) = ({1o} × tag 𝐷) → (⦅𝐴⦆ ∪ ({1o} × tag 𝐶)) = (⦅𝐵⦆ ∪ ({1o} × tag 𝐷)))) |
5 | 1, 2, 4 | syl2im 40 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 = 𝐷 → (⦅𝐴⦆ ∪ ({1o} × tag 𝐶)) = (⦅𝐵⦆ ∪ ({1o} × tag 𝐷)))) |
6 | df-bj-2upl 35887 | . . 3 ⊢ ⦅𝐴, 𝐶⦆ = (⦅𝐴⦆ ∪ ({1o} × tag 𝐶)) | |
7 | df-bj-2upl 35887 | . . 3 ⊢ ⦅𝐵, 𝐷⦆ = (⦅𝐵⦆ ∪ ({1o} × tag 𝐷)) | |
8 | 6, 7 | eqeq12i 2750 | . 2 ⊢ (⦅𝐴, 𝐶⦆ = ⦅𝐵, 𝐷⦆ ↔ (⦅𝐴⦆ ∪ ({1o} × tag 𝐶)) = (⦅𝐵⦆ ∪ ({1o} × tag 𝐷))) |
9 | 5, 8 | syl6ibr 251 | 1 ⊢ (𝐴 = 𝐵 → (𝐶 = 𝐷 → ⦅𝐴, 𝐶⦆ = ⦅𝐵, 𝐷⦆)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1541 ∪ cun 3946 {csn 4628 × cxp 5674 1oc1o 8458 tag bj-ctag 35850 ⦅bj-c1upl 35873 ⦅bj-c2uple 35886 |
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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-ext 2703 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-tru 1544 df-ex 1782 df-sb 2068 df-clab 2710 df-cleq 2724 df-clel 2810 df-rex 3071 df-v 3476 df-un 3953 df-opab 5211 df-xp 5682 df-bj-sngl 35842 df-bj-tag 35851 df-bj-1upl 35874 df-bj-2upl 35887 |
This theorem is referenced by: bj-2uplth 35897 |
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