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| Mirrors > Home > MPE Home > Th. List > uzind3 | Structured version Visualization version GIF version | ||
| Description: Induction on the upper integers that start at an integer 𝑀. The first four hypotheses give us the substitution instances we need, and the last two are the basis and the induction step. (Contributed by NM, 26-Jul-2005.) |
| Ref | Expression |
|---|---|
| uzind3.1 | ⊢ (𝑗 = 𝑀 → (𝜑 ↔ 𝜓)) |
| uzind3.2 | ⊢ (𝑗 = 𝑚 → (𝜑 ↔ 𝜒)) |
| uzind3.3 | ⊢ (𝑗 = (𝑚 + 1) → (𝜑 ↔ 𝜃)) |
| uzind3.4 | ⊢ (𝑗 = 𝑁 → (𝜑 ↔ 𝜏)) |
| uzind3.5 | ⊢ (𝑀 ∈ ℤ → 𝜓) |
| uzind3.6 | ⊢ ((𝑀 ∈ ℤ ∧ 𝑚 ∈ {𝑘 ∈ ℤ ∣ 𝑀 ≤ 𝑘}) → (𝜒 → 𝜃)) |
| Ref | Expression |
|---|---|
| uzind3 | ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ {𝑘 ∈ ℤ ∣ 𝑀 ≤ 𝑘}) → 𝜏) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | breq2 5107 | . . 3 ⊢ (𝑘 = 𝑁 → (𝑀 ≤ 𝑘 ↔ 𝑀 ≤ 𝑁)) | |
| 2 | 1 | elrab 3645 | . 2 ⊢ (𝑁 ∈ {𝑘 ∈ ℤ ∣ 𝑀 ≤ 𝑘} ↔ (𝑁 ∈ ℤ ∧ 𝑀 ≤ 𝑁)) |
| 3 | uzind3.1 | . . . 4 ⊢ (𝑗 = 𝑀 → (𝜑 ↔ 𝜓)) | |
| 4 | uzind3.2 | . . . 4 ⊢ (𝑗 = 𝑚 → (𝜑 ↔ 𝜒)) | |
| 5 | uzind3.3 | . . . 4 ⊢ (𝑗 = (𝑚 + 1) → (𝜑 ↔ 𝜃)) | |
| 6 | uzind3.4 | . . . 4 ⊢ (𝑗 = 𝑁 → (𝜑 ↔ 𝜏)) | |
| 7 | uzind3.5 | . . . 4 ⊢ (𝑀 ∈ ℤ → 𝜓) | |
| 8 | breq2 5107 | . . . . . . 7 ⊢ (𝑘 = 𝑚 → (𝑀 ≤ 𝑘 ↔ 𝑀 ≤ 𝑚)) | |
| 9 | 8 | elrab 3645 | . . . . . 6 ⊢ (𝑚 ∈ {𝑘 ∈ ℤ ∣ 𝑀 ≤ 𝑘} ↔ (𝑚 ∈ ℤ ∧ 𝑀 ≤ 𝑚)) |
| 10 | uzind3.6 | . . . . . 6 ⊢ ((𝑀 ∈ ℤ ∧ 𝑚 ∈ {𝑘 ∈ ℤ ∣ 𝑀 ≤ 𝑘}) → (𝜒 → 𝜃)) | |
| 11 | 9, 10 | sylan2br 607 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ (𝑚 ∈ ℤ ∧ 𝑀 ≤ 𝑚)) → (𝜒 → 𝜃)) |
| 12 | 11 | 3impb 1132 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑚 ∈ ℤ ∧ 𝑀 ≤ 𝑚) → (𝜒 → 𝜃)) |
| 13 | 3, 4, 5, 6, 7, 12 | uzind 12746 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ≤ 𝑁) → 𝜏) |
| 14 | 13 | 3expb 1138 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ (𝑁 ∈ ℤ ∧ 𝑀 ≤ 𝑁)) → 𝜏) |
| 15 | 2, 14 | sylan2b 606 | 1 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ {𝑘 ∈ ℤ ∣ 𝑀 ≤ 𝑘}) → 𝜏) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 {crab 3412 class class class wbr 5103 (class class class)co 7409 1c1 11158 + caddc 11160 ≤ cle 11301 ℤcz 12648 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7735 ax-resscn 11214 ax-1cn 11215 ax-icn 11216 ax-addcl 11217 ax-addrcl 11218 ax-mulcl 11219 ax-mulrcl 11220 ax-mulcom 11221 ax-addass 11222 ax-mulass 11223 ax-distr 11224 ax-i2m1 11225 ax-1ne0 11226 ax-1rid 11227 ax-rnegex 11228 ax-rrecex 11229 ax-cnre 11230 ax-pre-lttri 11231 ax-pre-lttrn 11232 ax-pre-ltadd 11233 ax-pre-mulgt0 11234 |
| 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 2100 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 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5543 df-eprel 5548 df-po 5556 df-so 5557 df-fr 5601 df-we 5603 df-xp 5654 df-rel 5655 df-cnv 5656 df-co 5657 df-dm 5658 df-rn 5659 df-res 5660 df-ima 5661 df-pred 6294 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-iota 6484 df-fun 6530 df-fn 6531 df-f 6532 df-f1 6533 df-fo 6534 df-f1o 6535 df-fv 6536 df-riota 7366 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7862 df-2nd 7986 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-pnf 11302 df-mnf 11303 df-xr 11304 df-ltxr 11305 df-le 11306 df-sub 11500 df-neg 11501 df-nn 12291 df-n0 12562 df-z 12649 |
| This theorem is used by: uzind4 12988 algfx 16703 |
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