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| Mirrors > Home > ILE Home > Th. List > sylan9bb | GIF version | ||
| Description: Nested syllogism inference conjoining dissimilar antecedents. (Contributed by NM, 4-Mar-1995.) |
| Ref | Expression |
|---|---|
| sylan9bb.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| sylan9bb.2 | ⊢ (𝜃 → (𝜒 ↔ 𝜏)) |
| Ref | Expression |
|---|---|
| sylan9bb | ⊢ ((𝜑 ∧ 𝜃) → (𝜓 ↔ 𝜏)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sylan9bb.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
| 2 | 1 | adantr 276 | . 2 ⊢ ((𝜑 ∧ 𝜃) → (𝜓 ↔ 𝜒)) |
| 3 | sylan9bb.2 | . . 3 ⊢ (𝜃 → (𝜒 ↔ 𝜏)) | |
| 4 | 3 | adantl 277 | . 2 ⊢ ((𝜑 ∧ 𝜃) → (𝜒 ↔ 𝜏)) |
| 5 | 2, 4 | bitrd 188 | 1 ⊢ ((𝜑 ∧ 𝜃) → (𝜓 ↔ 𝜏)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 |
| This theorem depends on definitions: df-bi 117 |
| This theorem is referenced by: sylan9bbr 467 bi2anan9 614 baibd 935 rbaibd 936 syl3an9b 1351 sbcomxyyz 2032 eqeq12 2251 eleq12 2303 sbhypf 2872 ceqsrex2v 2958 sseq12 3273 rexprg 3757 rextpg 3759 breq12 4130 opelopabg 4405 brabg 4406 opelopabgf 4407 opelopab2 4408 ralxpf 4921 rexxpf 4922 feq23 5514 f00 5579 fconstg 5584 f1oeq23 5625 f1o00 5671 f1oiso 6022 riota1a 6049 cbvmpox 6156 caovord 6251 caovord3 6253 rbropapd 6503 suppeqfsuppbi 7285 isacnm 7549 genpelvl 7869 genpelvu 7870 nn0ind-raph 9742 elpq 10028 xnn0xadd0 10248 elfz 10396 elfzp12 10484 wrd2ind 11473 shftfibg 11563 shftfib 11566 absdvdsb 12554 dvdsabsb 12555 dvdsabseq 12592 islmod 14600 znidom 14964 tgss2 15103 lmbr 15237 xmetec 15461 2lgslem1a 16121 edgiedgbg 16220 |
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