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| Mirrors > Home > MPE Home > Th. List > nn0ind | Structured version Visualization version 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 12746 | . 2 ⊢ (𝐴 ∈ ℕ0 ↔ (𝐴 ∈ ℤ ∧ 0 ≤ 𝐴)) | |
| 2 | 0z 12744 | . . 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 11 | . . . 4 ⊢ (0 ∈ ℤ → 𝜓) |
| 9 | elnn0z 12746 | . . . . . 6 ⊢ (𝑦 ∈ ℕ0 ↔ (𝑦 ∈ ℤ ∧ 0 ≤ 𝑦)) | |
| 10 | nn0ind.6 | . . . . . 6 ⊢ (𝑦 ∈ ℕ0 → (𝜒 → 𝜃)) | |
| 11 | 9, 10 | sylbir 238 | . . . . 5 ⊢ ((𝑦 ∈ ℤ ∧ 0 ≤ 𝑦) → (𝜒 → 𝜃)) |
| 12 | 11 | 3adant1 1148 | . . . 4 ⊢ ((0 ∈ ℤ ∧ 𝑦 ∈ ℤ ∧ 0 ≤ 𝑦) → (𝜒 → 𝜃)) |
| 13 | 3, 4, 5, 6, 8, 12 | uzind 12831 | . . 3 ⊢ ((0 ∈ ℤ ∧ 𝐴 ∈ ℤ ∧ 0 ≤ 𝐴) → 𝜏) |
| 14 | 2, 13 | mp3an1 1478 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 0 ≤ 𝐴) → 𝜏) |
| 15 | 1, 14 | sylbi 220 | 1 ⊢ (𝐴 ∈ ℕ0 → 𝜏) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2147 class class class wbr 5108 (class class class)co 7451 0cc0 11239 1c1 11240 + caddc 11242 ≤ cle 11383 ℕ0cn0 12646 ℤcz 12733 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-nn 12376 df-n0 12647 df-z 12734 |
| This theorem is used by: nn0indALT 12835 nn0indd 12836 zindd 12840 fzennn 14151 mulexp 14284 expadd 14287 expmul 14290 leexp1a 14358 bernneq 14414 modexp 14423 faccl 14468 facdiv 14472 facwordi 14474 faclbnd 14475 facubnd 14485 bccl 14507 brfi1indALT 14696 wrdind 14913 wrd2ind 14914 cshweqrep 15014 rtrclreclem4 15257 relexpindlem 15259 iseraltlem2 15894 binom 16043 climcndslem1 16062 binomfallfac 16251 demoivreALT 16413 ruclem8 16449 odd2np1lem 16554 bitsinv1 16656 sadcadd 16672 sadadd2 16674 saddisjlem 16678 smu01lem 16699 smumullem 16706 alginv 16794 prmfac1 16940 pcfac 17121 ramcl 17251 mhmmulg 19375 psgnunilem3 19761 sylow1lem1 19863 efgsrel 19999 efgsfo 20004 efgred 20013 srgmulgass 20494 srgpcomp 20495 srgbinom 20508 lmodvsmmulgdi 21223 cnfldexp 21763 cnsrexpcl 21778 assamulgscm 22264 mplcoe3 22402 expcn 25248 dvnadd 26304 dvnres 26306 dvnfre 26327 ply1divex 26510 fta1g 26543 plyco 26615 dgrco 26649 dvnply2 26663 plydivex 26673 fta1 26684 cxpmul2 27074 facgam 27450 dchrisumlem1 27873 qabvle 28009 qabvexp 28010 ostth2lem2 28018 rusgrnumwwlk 30624 eupth2 30897 ex-ind-dvds 31119 wrdt2ind 33612 subfacval2 36160 cvmliftlem7 36264 bccolsum 36719 faclim 36726 faclim2 36728 heiborlem4 39014 sumcubes 43636 mzpexpmpt 44022 pell14qrexpclnn0 44139 rmxypos 44220 jm2.17a 44233 jm2.17b 44234 rmygeid 44237 jm2.19lem3 44264 hbtlem5 44395 relexpiidm 44965 fperiodmullem 46592 stoweidlem17 47300 stoweidlem19 47302 wallispilem3 47350 fmtnorec2 48901 lmodvsmdi 49822 itcovalt2 50120 ackendofnn0 50127 |
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