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| Mirrors > Home > ILE Home > Th. List > sylanb | GIF version | ||
| Description: A syllogism inference. (Contributed by NM, 18-May-1994.) |
| Ref | Expression |
|---|---|
| sylanb.1 | ⊢ (𝜑 ↔ 𝜓) |
| sylanb.2 | ⊢ ((𝜓 ∧ 𝜒) → 𝜃) |
| Ref | Expression |
|---|---|
| sylanb | ⊢ ((𝜑 ∧ 𝜒) → 𝜃) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sylanb.1 | . . 3 ⊢ (𝜑 ↔ 𝜓) | |
| 2 | 1 | biimpi 120 | . 2 ⊢ (𝜑 → 𝜓) |
| 3 | sylanb.2 | . 2 ⊢ ((𝜓 ∧ 𝜒) → 𝜃) | |
| 4 | 2, 3 | sylan 283 | 1 ⊢ ((𝜑 ∧ 𝜒) → 𝜃) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 |
| This proof depends on definitions: df-bi 117 |
| This theorem is used by: syl2anb 291 anabsan 581 2exeu 2179 eqtr2 2257 pm13.181 2502 rmob 3145 disjne 3578 seex 4482 tron 4529 fssres 5568 funbrfvb 5746 funopfvb 5747 fvelrnb 5753 fvco 5778 fvimacnvi 5826 ffvresb 5874 fcof 5897 funresdfunsnss 5921 fvtp2g 5927 fvtp2 5930 fnex 5940 funex 5943 1st2nd 6419 imacosuppfn 6512 dftpos4 6539 nnmsucr 6766 nnmcan 6797 xpmapenlem 7155 fundmfibi 7258 sup3exmid 9295 nzadd 9706 peano5uzti 9764 fnn0ind 9772 uztrn2 9955 irradd 10061 xltnegi 10253 xaddnemnf 10275 xaddnepnf 10276 xaddcom 10279 xnegdi 10286 elioore 10330 uzsubsubfz1 10469 fzo1fzo0n0 10611 elfzonelfzo 10664 qbtwnxr 10708 faclbnd 11200 faclbnd3 11202 swrdccat3b 11533 dvdsprime 12924 pcgcd 13136 cntri 14164 cntzsgrpcl 14166 znf1o 15094 restuni 15415 stoig 15416 cnnei 15475 tgioo 15797 divcnap 15808 ivthdich 15896 lgsdi 16378 bj-indind 17180 |
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