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Mirrors > Home > ILE Home > Th. List > 3bitr3ri | GIF version |
Description: A chained inference from transitive law for logical equivalence. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
3bitr3i.1 | ⊢ (𝜑 ↔ 𝜓) |
3bitr3i.2 | ⊢ (𝜑 ↔ 𝜒) |
3bitr3i.3 | ⊢ (𝜓 ↔ 𝜃) |
Ref | Expression |
---|---|
3bitr3ri | ⊢ (𝜃 ↔ 𝜒) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3bitr3i.3 | . 2 ⊢ (𝜓 ↔ 𝜃) | |
2 | 3bitr3i.1 | . . 3 ⊢ (𝜑 ↔ 𝜓) | |
3 | 3bitr3i.2 | . . 3 ⊢ (𝜑 ↔ 𝜒) | |
4 | 2, 3 | bitr3i 184 | . 2 ⊢ (𝜓 ↔ 𝜒) |
5 | 1, 4 | bitr3i 184 | 1 ⊢ (𝜃 ↔ 𝜒) |
Colors of variables: wff set class |
Syntax hints: ↔ wb 103 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: bigolden 896 sb9 1896 sbcco 2836 dfiin2g 3711 dffun6f 4935 |
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