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| Mirrors > Home > MPE Home > Th. List > peano5uzti | Structured version Visualization version GIF version | ||
| Description: Peano's inductive postulate for upper integers. (Contributed by NM, 6-Jul-2005.) (Revised by Mario Carneiro, 25-Jul-2013.) |
| Ref | Expression |
|---|---|
| peano5uzti | ⊢ (𝑁 ∈ ℤ → ((𝑁 ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝑥 + 1) ∈ 𝐴) → {𝑘 ∈ ℤ ∣ 𝑁 ≤ 𝑘} ⊆ 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 2848 | . . . 4 ⊢ (𝑁 = if(𝑁 ∈ ℤ, 𝑁, 1) → (𝑁 ∈ 𝐴 ↔ if(𝑁 ∈ ℤ, 𝑁, 1) ∈ 𝐴)) | |
| 2 | 1 | anbi1d 643 | . . 3 ⊢ (𝑁 = if(𝑁 ∈ ℤ, 𝑁, 1) → ((𝑁 ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝑥 + 1) ∈ 𝐴) ↔ (if(𝑁 ∈ ℤ, 𝑁, 1) ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝑥 + 1) ∈ 𝐴))) |
| 3 | breq1 5105 | . . . . 5 ⊢ (𝑁 = if(𝑁 ∈ ℤ, 𝑁, 1) → (𝑁 ≤ 𝑘 ↔ if(𝑁 ∈ ℤ, 𝑁, 1) ≤ 𝑘)) | |
| 4 | 3 | rabbidv 3419 | . . . 4 ⊢ (𝑁 = if(𝑁 ∈ ℤ, 𝑁, 1) → {𝑘 ∈ ℤ ∣ 𝑁 ≤ 𝑘} = {𝑘 ∈ ℤ ∣ if(𝑁 ∈ ℤ, 𝑁, 1) ≤ 𝑘}) |
| 5 | 4 | sseq1d 3939 | . . 3 ⊢ (𝑁 = if(𝑁 ∈ ℤ, 𝑁, 1) → ({𝑘 ∈ ℤ ∣ 𝑁 ≤ 𝑘} ⊆ 𝐴 ↔ {𝑘 ∈ ℤ ∣ if(𝑁 ∈ ℤ, 𝑁, 1) ≤ 𝑘} ⊆ 𝐴)) |
| 6 | 2, 5 | imbi12d 347 | . 2 ⊢ (𝑁 = if(𝑁 ∈ ℤ, 𝑁, 1) → (((𝑁 ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝑥 + 1) ∈ 𝐴) → {𝑘 ∈ ℤ ∣ 𝑁 ≤ 𝑘} ⊆ 𝐴) ↔ ((if(𝑁 ∈ ℤ, 𝑁, 1) ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝑥 + 1) ∈ 𝐴) → {𝑘 ∈ ℤ ∣ if(𝑁 ∈ ℤ, 𝑁, 1) ≤ 𝑘} ⊆ 𝐴))) |
| 7 | 1z 12726 | . . . 4 ⊢ 1 ∈ ℤ | |
| 8 | 7 | elimel 4551 | . . 3 ⊢ if(𝑁 ∈ ℤ, 𝑁, 1) ∈ ℤ |
| 9 | 8 | peano5uzi 12788 | . 2 ⊢ ((if(𝑁 ∈ ℤ, 𝑁, 1) ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝑥 + 1) ∈ 𝐴) → {𝑘 ∈ ℤ ∣ if(𝑁 ∈ ℤ, 𝑁, 1) ≤ 𝑘} ⊆ 𝐴) |
| 10 | 6, 9 | dedth 4540 | 1 ⊢ (𝑁 ∈ ℤ → ((𝑁 ∈ 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝑥 + 1) ∈ 𝐴) → {𝑘 ∈ ℤ ∣ 𝑁 ≤ 𝑘} ⊆ 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1569 ∈ wcel 2144 ∀wral 3076 {crab 3412 ⊆ wss 3895 ifcif 4481 class class class wbr 5102 (class class class)co 7420 1c1 11201 + caddc 11203 ≤ cle 11344 ℤcz 12693 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-resscn 11257 ax-1cn 11258 ax-icn 11259 ax-addcl 11260 ax-addrcl 11261 ax-mulcl 11262 ax-mulrcl 11263 ax-mulcom 11264 ax-addass 11265 ax-mulass 11266 ax-distr 11267 ax-i2m1 11268 ax-1ne0 11269 ax-1rid 11270 ax-rnegex 11271 ax-rrecex 11272 ax-cnre 11273 ax-pre-lttri 11274 ax-pre-lttrn 11275 ax-pre-ltadd 11276 ax-pre-mulgt0 11277 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-2nd 8002 df-frecs 8299 df-wrecs 8330 df-recs 8379 df-rdg 8418 df-er 8717 df-en 8974 df-dom 8975 df-sdom 8976 df-pnf 11345 df-mnf 11346 df-xr 11347 df-ltxr 11348 df-le 11349 df-sub 11543 df-neg 11544 df-nn 12336 df-n0 12607 df-z 12694 |
| This theorem is used by: uzind 12791 |
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