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| Mirrors > Home > MPE Home > Th. List > peano2uz2 | Structured version Visualization version GIF version | ||
| Description: Second Peano postulate for upper integers. (Contributed by NM, 3-Oct-2004.) |
| Ref | Expression |
|---|---|
| peano2uz2 | ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ {𝑥 ∈ ℤ ∣ 𝐴 ≤ 𝑥}) → (𝐵 + 1) ∈ {𝑥 ∈ ℤ ∣ 𝐴 ≤ 𝑥}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | peano2z 12645 | . . . 4 ⊢ (𝐵 ∈ ℤ → (𝐵 + 1) ∈ ℤ) | |
| 2 | 1 | ad2antrl 741 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ (𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵)) → (𝐵 + 1) ∈ ℤ) |
| 3 | zre 12605 | . . . . 5 ⊢ (𝐴 ∈ ℤ → 𝐴 ∈ ℝ) | |
| 4 | zre 12605 | . . . . 5 ⊢ (𝐵 ∈ ℤ → 𝐵 ∈ ℝ) | |
| 5 | lep1 12066 | . . . . . . 7 ⊢ (𝐵 ∈ ℝ → 𝐵 ≤ (𝐵 + 1)) | |
| 6 | 5 | adantl 487 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → 𝐵 ≤ (𝐵 + 1)) |
| 7 | peano2re 11393 | . . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵 + 1) ∈ ℝ) | |
| 8 | 7 | ancli 558 | . . . . . . 7 ⊢ (𝐵 ∈ ℝ → (𝐵 ∈ ℝ ∧ (𝐵 + 1) ∈ ℝ)) |
| 9 | letr 11314 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐵 + 1) ∈ ℝ) → ((𝐴 ≤ 𝐵 ∧ 𝐵 ≤ (𝐵 + 1)) → 𝐴 ≤ (𝐵 + 1))) | |
| 10 | 9 | 3expb 1138 | . . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ (𝐵 ∈ ℝ ∧ (𝐵 + 1) ∈ ℝ)) → ((𝐴 ≤ 𝐵 ∧ 𝐵 ≤ (𝐵 + 1)) → 𝐴 ≤ (𝐵 + 1))) |
| 11 | 8, 10 | sylan2 605 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝐴 ≤ 𝐵 ∧ 𝐵 ≤ (𝐵 + 1)) → 𝐴 ≤ (𝐵 + 1))) |
| 12 | 6, 11 | mpan2d 707 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 → 𝐴 ≤ (𝐵 + 1))) |
| 13 | 3, 4, 12 | syl2an 608 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (𝐴 ≤ 𝐵 → 𝐴 ≤ (𝐵 + 1))) |
| 14 | 13 | impr 460 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ (𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵)) → 𝐴 ≤ (𝐵 + 1)) |
| 15 | 2, 14 | jca 521 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ (𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵)) → ((𝐵 + 1) ∈ ℤ ∧ 𝐴 ≤ (𝐵 + 1))) |
| 16 | breq2 5116 | . . . 4 ⊢ (𝑥 = 𝐵 → (𝐴 ≤ 𝑥 ↔ 𝐴 ≤ 𝐵)) | |
| 17 | 16 | elrab 3653 | . . 3 ⊢ (𝐵 ∈ {𝑥 ∈ ℤ ∣ 𝐴 ≤ 𝑥} ↔ (𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵)) |
| 18 | 17 | anbi2i 635 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ {𝑥 ∈ ℤ ∣ 𝐴 ≤ 𝑥}) ↔ (𝐴 ∈ ℤ ∧ (𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵))) |
| 19 | breq2 5116 | . . 3 ⊢ (𝑥 = (𝐵 + 1) → (𝐴 ≤ 𝑥 ↔ 𝐴 ≤ (𝐵 + 1))) | |
| 20 | 19 | elrab 3653 | . 2 ⊢ ((𝐵 + 1) ∈ {𝑥 ∈ ℤ ∣ 𝐴 ≤ 𝑥} ↔ ((𝐵 + 1) ∈ ℤ ∧ 𝐴 ≤ (𝐵 + 1))) |
| 21 | 15, 18, 20 | 3imtr4i 295 | 1 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ {𝑥 ∈ ℤ ∣ 𝐴 ≤ 𝑥}) → (𝐵 + 1) ∈ {𝑥 ∈ ℤ ∣ 𝐴 ≤ 𝑥}) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2146 {crab 3419 class class class wbr 5112 (class class class)co 7416 ℝcr 11109 1c1 11111 + caddc 11113 ≤ cle 11254 ℤcz 12601 |
| 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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2738 ax-sep 5260 ax-nul 5272 ax-pow 5339 ax-pr 5407 ax-un 7738 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 |
| 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 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-nel 3068 df-ral 3083 df-rex 3093 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3928 df-nul 4290 df-if 4491 df-pw 4567 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4876 df-iun 4961 df-br 5113 df-opab 5177 df-mpt 5196 df-tr 5222 df-id 5559 df-eprel 5564 df-po 5572 df-so 5573 df-fr 5617 df-we 5619 df-xp 5670 df-rel 5671 df-cnv 5672 df-co 5673 df-dm 5674 df-rn 5675 df-res 5676 df-ima 5677 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7865 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11453 df-neg 11454 df-nn 12244 df-n0 12515 df-z 12602 |
| This theorem is used by: dfuzi 12697 |
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