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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 6538 nnmsucr 6765 nnmcan 6796 xpmapenlem 7153 fundmfibi 7256 sup3exmid 9295 nzadd 9708 peano5uzti 9765 fnn0ind 9773 uztrn2 9956 irradd 10062 xltnegi 10254 xaddnemnf 10276 xaddnepnf 10277 xaddcom 10280 xnegdi 10287 elioore 10331 uzsubsubfz1 10470 fzo1fzo0n0 10612 elfzonelfzo 10665 qbtwnxr 10709 faclbnd 11201 faclbnd3 11203 swrdccat3b 11534 dvdsprime 12925 pcgcd 13137 cntri 14165 cntzsgrpcl 14167 znf1o 15095 restuni 15398 stoig 15399 cnnei 15458 tgioo 15780 divcnap 15791 ivthdich 15879 lgsdi 16361 bj-indind 17163 |
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