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Mirrors > Home > MPE Home > Th. List > ifbieq12d2 | Structured version Visualization version GIF version |
Description: Equivalence deduction for conditional operators. (Contributed by Thierry Arnoux, 14-Feb-2017.) (Proof shortened by Wolf Lammen, 24-Jun-2021.) |
Ref | Expression |
---|---|
ifbieq12d2.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
ifbieq12d2.2 | ⊢ ((𝜑 ∧ 𝜓) → 𝐴 = 𝐶) |
ifbieq12d2.3 | ⊢ ((𝜑 ∧ ¬ 𝜓) → 𝐵 = 𝐷) |
Ref | Expression |
---|---|
ifbieq12d2 | ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ifbieq12d2.2 | . . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝐴 = 𝐶) | |
2 | ifbieq12d2.3 | . . 3 ⊢ ((𝜑 ∧ ¬ 𝜓) → 𝐵 = 𝐷) | |
3 | 1, 2 | ifeq12da 4457 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜓, 𝐶, 𝐷)) |
4 | ifbieq12d2.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
5 | 4 | ifbid 4447 | . 2 ⊢ (𝜑 → if(𝜓, 𝐶, 𝐷) = if(𝜒, 𝐶, 𝐷)) |
6 | 3, 5 | eqtrd 2833 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1538 ifcif 4425 |
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-9 2121 ax-10 2142 ax-12 2175 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-rab 3115 df-v 3443 df-un 3886 df-if 4426 |
This theorem is referenced by: ofccat 14320 itgeq12dv 31694 sgnneg 31908 |
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