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| Mirrors > Home > ILE Home > Th. List > nn0ind | GIF version | ||
| Description: Principle of Mathematical Induction (inference schema) on nonnegative integers. The first four hypotheses give us the substitution instances we need; the last two are the basis and the induction step. (Contributed by NM, 13-May-2004.) |
| Ref | Expression |
|---|---|
| nn0ind.1 | ⊢ (𝑥 = 0 → (𝜑 ↔ 𝜓)) |
| nn0ind.2 | ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜒)) |
| nn0ind.3 | ⊢ (𝑥 = (𝑦 + 1) → (𝜑 ↔ 𝜃)) |
| nn0ind.4 | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜏)) |
| nn0ind.5 | ⊢ 𝜓 |
| nn0ind.6 | ⊢ (𝑦 ∈ ℕ0 → (𝜒 → 𝜃)) |
| Ref | Expression |
|---|---|
| nn0ind | ⊢ (𝐴 ∈ ℕ0 → 𝜏) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elnn0z 9668 | . 2 ⊢ (𝐴 ∈ ℕ0 ↔ (𝐴 ∈ ℤ ∧ 0 ≤ 𝐴)) | |
| 2 | 0z 9666 | . . 3 ⊢ 0 ∈ ℤ | |
| 3 | nn0ind.1 | . . . 4 ⊢ (𝑥 = 0 → (𝜑 ↔ 𝜓)) | |
| 4 | nn0ind.2 | . . . 4 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜒)) | |
| 5 | nn0ind.3 | . . . 4 ⊢ (𝑥 = (𝑦 + 1) → (𝜑 ↔ 𝜃)) | |
| 6 | nn0ind.4 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜏)) | |
| 7 | nn0ind.5 | . . . . 5 ⊢ 𝜓 | |
| 8 | 7 | a1i 9 | . . . 4 ⊢ (0 ∈ ℤ → 𝜓) |
| 9 | elnn0z 9668 | . . . . . 6 ⊢ (𝑦 ∈ ℕ0 ↔ (𝑦 ∈ ℤ ∧ 0 ≤ 𝑦)) | |
| 10 | nn0ind.6 | . . . . . 6 ⊢ (𝑦 ∈ ℕ0 → (𝜒 → 𝜃)) | |
| 11 | 9, 10 | sylbir 135 | . . . . 5 ⊢ ((𝑦 ∈ ℤ ∧ 0 ≤ 𝑦) → (𝜒 → 𝜃)) |
| 12 | 11 | 3adant1 1046 | . . . 4 ⊢ ((0 ∈ ℤ ∧ 𝑦 ∈ ℤ ∧ 0 ≤ 𝑦) → (𝜒 → 𝜃)) |
| 13 | 3, 4, 5, 6, 8, 12 | uzind 9768 | . . 3 ⊢ ((0 ∈ ℤ ∧ 𝐴 ∈ ℤ ∧ 0 ≤ 𝐴) → 𝜏) |
| 14 | 2, 13 | mp3an1 1365 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 0 ≤ 𝐴) → 𝜏) |
| 15 | 1, 14 | sylbi 121 | 1 ⊢ (𝐴 ∈ ℕ0 → 𝜏) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1402 ∈ wcel 2209 class class class wbr 4131 (class class class)co 6088 0cc0 8185 1c1 8186 + caddc 8188 ≤ cle 8367 ℕ0cn0 9574 ℤcz 9655 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-cnex 8276 ax-resscn 8277 ax-1cn 8278 ax-1re 8279 ax-icn 8280 ax-addcl 8281 ax-addrcl 8282 ax-mulcl 8283 ax-addcom 8285 ax-addass 8287 ax-distr 8289 ax-i2m1 8290 ax-0lt1 8291 ax-0id 8293 ax-rnegex 8294 ax-cnre 8296 ax-pre-ltirr 8297 ax-pre-ltwlin 8298 ax-pre-lttrn 8299 ax-pre-ltadd 8301 |
| This proof depends on definitions: df-bi 117 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4132 df-opab 4194 df-id 4440 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-iota 5340 df-fun 5382 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-pnf 8368 df-mnf 8369 df-xr 8370 df-ltxr 8371 df-le 8372 df-sub 8506 df-neg 8507 df-inn 9314 df-n0 9575 df-z 9656 |
| This theorem is used by: zindd 9775 uzaddcl 10002 frecfzennn 10884 mulexp 11036 expadd 11039 expmul 11042 leexp1a 11052 bernneq 11119 modqexp 11125 nn0ltexp2 11169 faccl 11195 facdiv 11198 facwordi 11200 faclbnd 11201 faclbnd6 11204 facubnd 11205 bccl 11227 wrdind 11516 wrd2ind 11517 cjexp 11680 absexp 11868 binom 12276 bcxmas 12281 fprodfac 12407 demoivreALT 12566 odd2np1lem 12664 bitsinv1 12754 alginv 12850 prmfac1 12956 pcfac 13158 ennnfonelemhf1o 13362 mhmmulg 14025 srgmulgass 14400 srgpcomp 14401 lmodvsmmulgdi 14769 cnfldexp 15023 assamulgscm 15152 expcn 15795 expcncf 15835 plycolemc 15984 rpcxpmul2 16146 eupth2fi 16925 depindlem2 16953 depindlem3 16954 |
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