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| Mirrors > Home > MPE Home > Th. List > noseqinds | Structured version Visualization version GIF version | ||
| Description: Induction schema for surreal sequences. (Contributed by Scott Fenton, 18-Apr-2025.) |
| Ref | Expression |
|---|---|
| noseq.1 | ⊢ (𝜑 → 𝑍 = (rec((𝑥 ∈ V ↦ (𝑥 +s 1s )), 𝐴) “ ω)) |
| noseq.2 | ⊢ (𝜑 → 𝐴 ∈ No ) |
| noseqinds.3 | ⊢ (𝑦 = 𝐴 → (𝜓 ↔ 𝜒)) |
| noseqinds.4 | ⊢ (𝑦 = 𝑧 → (𝜓 ↔ 𝜃)) |
| noseqinds.5 | ⊢ (𝑦 = (𝑧 +s 1s ) → (𝜓 ↔ 𝜏)) |
| noseqinds.6 | ⊢ (𝑦 = 𝐵 → (𝜓 ↔ 𝜂)) |
| noseqinds.7 | ⊢ (𝜑 → 𝜒) |
| noseqinds.8 | ⊢ ((𝜑 ∧ 𝑧 ∈ 𝑍) → (𝜃 → 𝜏)) |
| Ref | Expression |
|---|---|
| noseqinds | ⊢ ((𝜑 ∧ 𝐵 ∈ 𝑍) → 𝜂) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noseq.1 | . . . . 5 ⊢ (𝜑 → 𝑍 = (rec((𝑥 ∈ V ↦ (𝑥 +s 1s )), 𝐴) “ ω)) | |
| 2 | noseq.2 | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ No ) | |
| 3 | noseqinds.3 | . . . . . 6 ⊢ (𝑦 = 𝐴 → (𝜓 ↔ 𝜒)) | |
| 4 | 1, 2 | noseq0 28286 | . . . . . 6 ⊢ (𝜑 → 𝐴 ∈ 𝑍) |
| 5 | noseqinds.7 | . . . . . 6 ⊢ (𝜑 → 𝜒) | |
| 6 | 3, 4, 5 | elrabd 3648 | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ {𝑦 ∈ 𝑍 ∣ 𝜓}) |
| 7 | noseqinds.8 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝑍) → (𝜃 → 𝜏)) | |
| 8 | 1 | adantr 480 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝑍) → 𝑍 = (rec((𝑥 ∈ V ↦ (𝑥 +s 1s )), 𝐴) “ ω)) |
| 9 | 2 | adantr 480 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝑍) → 𝐴 ∈ No ) |
| 10 | simpr 484 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝑍) → 𝑧 ∈ 𝑍) | |
| 11 | 8, 9, 10 | noseqp1 28287 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝑍) → (𝑧 +s 1s ) ∈ 𝑍) |
| 12 | 7, 11 | jctild 525 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝑍) → (𝜃 → ((𝑧 +s 1s ) ∈ 𝑍 ∧ 𝜏))) |
| 13 | 12 | expimpd 453 | . . . . . . 7 ⊢ (𝜑 → ((𝑧 ∈ 𝑍 ∧ 𝜃) → ((𝑧 +s 1s ) ∈ 𝑍 ∧ 𝜏))) |
| 14 | noseqinds.4 | . . . . . . . 8 ⊢ (𝑦 = 𝑧 → (𝜓 ↔ 𝜃)) | |
| 15 | 14 | elrab 3646 | . . . . . . 7 ⊢ (𝑧 ∈ {𝑦 ∈ 𝑍 ∣ 𝜓} ↔ (𝑧 ∈ 𝑍 ∧ 𝜃)) |
| 16 | noseqinds.5 | . . . . . . . 8 ⊢ (𝑦 = (𝑧 +s 1s ) → (𝜓 ↔ 𝜏)) | |
| 17 | 16 | elrab 3646 | . . . . . . 7 ⊢ ((𝑧 +s 1s ) ∈ {𝑦 ∈ 𝑍 ∣ 𝜓} ↔ ((𝑧 +s 1s ) ∈ 𝑍 ∧ 𝜏)) |
| 18 | 13, 15, 17 | 3imtr4g 296 | . . . . . 6 ⊢ (𝜑 → (𝑧 ∈ {𝑦 ∈ 𝑍 ∣ 𝜓} → (𝑧 +s 1s ) ∈ {𝑦 ∈ 𝑍 ∣ 𝜓})) |
| 19 | 18 | imp 406 | . . . . 5 ⊢ ((𝜑 ∧ 𝑧 ∈ {𝑦 ∈ 𝑍 ∣ 𝜓}) → (𝑧 +s 1s ) ∈ {𝑦 ∈ 𝑍 ∣ 𝜓}) |
| 20 | 1, 2, 6, 19 | noseqind 28288 | . . . 4 ⊢ (𝜑 → 𝑍 ⊆ {𝑦 ∈ 𝑍 ∣ 𝜓}) |
| 21 | 20 | sselda 3933 | . . 3 ⊢ ((𝜑 ∧ 𝐵 ∈ 𝑍) → 𝐵 ∈ {𝑦 ∈ 𝑍 ∣ 𝜓}) |
| 22 | noseqinds.6 | . . . 4 ⊢ (𝑦 = 𝐵 → (𝜓 ↔ 𝜂)) | |
| 23 | 22 | elrab 3646 | . . 3 ⊢ (𝐵 ∈ {𝑦 ∈ 𝑍 ∣ 𝜓} ↔ (𝐵 ∈ 𝑍 ∧ 𝜂)) |
| 24 | 21, 23 | sylib 218 | . 2 ⊢ ((𝜑 ∧ 𝐵 ∈ 𝑍) → (𝐵 ∈ 𝑍 ∧ 𝜂)) |
| 25 | 24 | simprd 495 | 1 ⊢ ((𝜑 ∧ 𝐵 ∈ 𝑍) → 𝜂) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1541 ∈ wcel 2113 {crab 3399 Vcvv 3440 ↦ cmpt 5179 “ cima 5627 (class class class)co 7358 ωcom 7808 reccrdg 8340 No csur 27607 1s c1s 27802 +s cadds 27955 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7361 df-om 7809 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 |
| This theorem is referenced by: n0sind 28329 nnsind 28369 |
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