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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 4480 tron 4527 fssres 5565 funbrfvb 5743 funopfvb 5744 fvelrnb 5750 fvco 5775 fvimacnvi 5823 ffvresb 5871 fcof 5894 funresdfunsnss 5918 fvtp2g 5924 fvtp2 5927 fnex 5937 funex 5940 1st2nd 6415 imacosuppfn 6508 dftpos4 6534 nnmsucr 6761 nnmcan 6792 xpmapenlem 7149 fundmfibi 7252 sup3exmid 9289 nzadd 9701 peano5uzti 9758 fnn0ind 9766 uztrn2 9949 irradd 10055 xltnegi 10247 xaddnemnf 10269 xaddnepnf 10270 xaddcom 10273 xnegdi 10280 elioore 10324 uzsubsubfz1 10463 fzo1fzo0n0 10605 elfzonelfzo 10658 qbtwnxr 10702 faclbnd 11193 faclbnd3 11195 swrdccat3b 11526 dvdsprime 12916 pcgcd 13128 znf1o 15035 restuni 15322 stoig 15323 cnnei 15382 tgioo 15704 divcnap 15715 ivthdich 15803 lgsdi 16254 bj-indind 17056 |
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