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Related theorems GIF version |
| Description: Weak deduction theorem eliminating two hypotheses. |
| Ref | Expression |
|---|---|
| dedth2h.1 | ⊢ (A = if(φ, A, C) → (χ ↔ θ)) |
| dedth2h.2 | ⊢ (B = if(ψ, B, D) → (θ ↔ τ)) |
| dedth2h.3 | ⊢ τ |
| Ref | Expression |
|---|---|
| dedth2h | ⊢ ((φ ∧ ψ) → χ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dedth2h.1 | . . . 4 ⊢ (A = if(φ, A, C) → (χ ↔ θ)) | |
| 2 | 1 | imbi2d 464 | . . 3 ⊢ (A = if(φ, A, C) → ((ψ → χ) ↔ (ψ → θ))) |
| 3 | dedth2h.2 | . . . 4 ⊢ (B = if(ψ, B, D) → (θ ↔ τ)) | |
| 4 | dedth2h.3 | . . . 4 ⊢ τ | |
| 5 | 3, 4 | dedth 1784 | . . 3 ⊢ (ψ → θ) |
| 6 | 2, 5 | dedth 1784 | . 2 ⊢ (φ → (ψ → χ)) |
| 7 | 6 | imp 277 | 1 ⊢ ((φ ∧ ψ) → χ) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ↔ wb 127 ∧ wa 196 = wceq 1091 ifcif 1776 |
| This theorem is referenced by: dedth3h 1788 dedth4h 1789 limsuc 2361 oawordeu 3157 unfilem3 3440 subclt 4140 subnegt 4149 negcon1t 4167 subeq0t 4169 mulneg1t 4196 mul2negt 4199 negdit 4200 mul0ort 4212 divclt 4223 divcan1t 4228 divcan2t 4229 divrect 4238 divcan3t 4251 rec11 4262 redivclt 4276 letrit 4347 addge0t 4362 posdift 4365 ltnegt 4366 lenegt 4368 lesub0t 4374 mulge0t 4375 divgt0t 4402 divge0t 4403 ltrec 4410 ltdiv23 4413 ltrect 4417 lerect 4418 le2sqt 4420 nnsubt 4451 nn0mulclt 4554 sqe11t 4705 lt2sqet 4706 sqrmul 4763 sqr2irrlem2 4778 sqr2irrlem5 4781 cjaddt 4831 cjmult 4832 absmult 4849 absltt 4857 abssubt 4864 hvnegdit 5039 hvsubeq0t 5040 normsub0t 5085 norm-iiit 5088 normsubt 5091 normpytht 5092 norm3adift 5098 occllem2 5181 occllem8 5187 pjtht 5240 axpjpjt 5260 pjoc1t 5270 shsclt 5283 shslejt 5351 shinclt 5352 chinclt 5416 chsscon3t 5417 chlejb1t 5429 chnlet 5431 chdmm1t 5438 elspansn2t 5472 h1datomt 5484 pjoml3t 5517 spansnjt 5540 pjadjt 5576 pjaddt 5577 pjsubt 5578 pjmult 5579 pjcht 5582 pjnormt 5666 pjnelt 5667 chrelat2t 5761 cvexcht 5763 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-16 922 ax-17 925 ax-ext 1074 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-if 1777 |