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| Mirrors > Home > MPE Home > Th. List > cau3 | Structured version Visualization version GIF version | ||
| Description: Convert between three-quantifier and four-quantifier versions of the Cauchy criterion. (In particular, the four-quantifier version has no occurrence of 𝑗 in the assertion, so it can be used with rexanuz 15299 and friends.) (Contributed by Mario Carneiro, 15-Feb-2014.) |
| Ref | Expression |
|---|---|
| cau3.1 | ⊢ 𝑍 = (ℤ≥‘𝑀) |
| Ref | Expression |
|---|---|
| cau3 | ⊢ (∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − (𝐹‘𝑗))) < 𝑥) ↔ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘) ∈ ℂ ∧ ∀𝑚 ∈ (ℤ≥‘𝑘)(abs‘((𝐹‘𝑘) − (𝐹‘𝑚))) < 𝑥)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cau3.1 | . . . 4 ⊢ 𝑍 = (ℤ≥‘𝑀) | |
| 2 | uzssz 12800 | . . . 4 ⊢ (ℤ≥‘𝑀) ⊆ ℤ | |
| 3 | 1, 2 | eqsstri 3969 | . . 3 ⊢ 𝑍 ⊆ ℤ |
| 4 | id 22 | . . 3 ⊢ ((𝐹‘𝑘) ∈ ℂ → (𝐹‘𝑘) ∈ ℂ) | |
| 5 | eleq1 2825 | . . 3 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑗) → ((𝐹‘𝑘) ∈ ℂ ↔ (𝐹‘𝑗) ∈ ℂ)) | |
| 6 | eleq1 2825 | . . 3 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑚) → ((𝐹‘𝑘) ∈ ℂ ↔ (𝐹‘𝑚) ∈ ℂ)) | |
| 7 | abssub 15280 | . . . 4 ⊢ (((𝐹‘𝑗) ∈ ℂ ∧ (𝐹‘𝑘) ∈ ℂ) → (abs‘((𝐹‘𝑗) − (𝐹‘𝑘))) = (abs‘((𝐹‘𝑘) − (𝐹‘𝑗)))) | |
| 8 | 7 | 3adant1 1131 | . . 3 ⊢ ((⊤ ∧ (𝐹‘𝑗) ∈ ℂ ∧ (𝐹‘𝑘) ∈ ℂ) → (abs‘((𝐹‘𝑗) − (𝐹‘𝑘))) = (abs‘((𝐹‘𝑘) − (𝐹‘𝑗)))) |
| 9 | abssub 15280 | . . . 4 ⊢ (((𝐹‘𝑚) ∈ ℂ ∧ (𝐹‘𝑗) ∈ ℂ) → (abs‘((𝐹‘𝑚) − (𝐹‘𝑗))) = (abs‘((𝐹‘𝑗) − (𝐹‘𝑚)))) | |
| 10 | 9 | 3adant1 1131 | . . 3 ⊢ ((⊤ ∧ (𝐹‘𝑚) ∈ ℂ ∧ (𝐹‘𝑗) ∈ ℂ) → (abs‘((𝐹‘𝑚) − (𝐹‘𝑗))) = (abs‘((𝐹‘𝑗) − (𝐹‘𝑚)))) |
| 11 | abs3lem 15292 | . . . 4 ⊢ ((((𝐹‘𝑘) ∈ ℂ ∧ (𝐹‘𝑚) ∈ ℂ) ∧ ((𝐹‘𝑗) ∈ ℂ ∧ 𝑥 ∈ ℝ)) → (((abs‘((𝐹‘𝑘) − (𝐹‘𝑗))) < (𝑥 / 2) ∧ (abs‘((𝐹‘𝑗) − (𝐹‘𝑚))) < (𝑥 / 2)) → (abs‘((𝐹‘𝑘) − (𝐹‘𝑚))) < 𝑥)) | |
| 12 | 11 | 3adant1 1131 | . . 3 ⊢ ((⊤ ∧ ((𝐹‘𝑘) ∈ ℂ ∧ (𝐹‘𝑚) ∈ ℂ) ∧ ((𝐹‘𝑗) ∈ ℂ ∧ 𝑥 ∈ ℝ)) → (((abs‘((𝐹‘𝑘) − (𝐹‘𝑗))) < (𝑥 / 2) ∧ (abs‘((𝐹‘𝑗) − (𝐹‘𝑚))) < (𝑥 / 2)) → (abs‘((𝐹‘𝑘) − (𝐹‘𝑚))) < 𝑥)) |
| 13 | 3, 4, 5, 6, 8, 10, 12 | cau3lem 15308 | . 2 ⊢ (⊤ → (∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − (𝐹‘𝑗))) < 𝑥) ↔ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘) ∈ ℂ ∧ ∀𝑚 ∈ (ℤ≥‘𝑘)(abs‘((𝐹‘𝑘) − (𝐹‘𝑚))) < 𝑥))) |
| 14 | 13 | mptru 1549 | 1 ⊢ (∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − (𝐹‘𝑗))) < 𝑥) ↔ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘) ∈ ℂ ∧ ∀𝑚 ∈ (ℤ≥‘𝑘)(abs‘((𝐹‘𝑘) − (𝐹‘𝑚))) < 𝑥)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ⊤wtru 1543 ∈ wcel 2114 ∀wral 3052 ∃wrex 3062 class class class wbr 5086 ‘cfv 6492 (class class class)co 7360 ℂcc 11027 ℝcr 11028 < clt 11170 − cmin 11368 / cdiv 11798 2c2 12227 ℤcz 12515 ℤ≥cuz 12779 ℝ+crp 12933 abscabs 15187 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 ax-pre-sup 11107 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-2nd 7936 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-sup 9348 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-div 11799 df-nn 12166 df-2 12235 df-3 12236 df-n0 12429 df-z 12516 df-uz 12780 df-rp 12934 df-seq 13955 df-exp 14015 df-cj 15052 df-re 15053 df-im 15054 df-sqrt 15188 df-abs 15189 |
| This theorem is referenced by: cau4 15310 serf0 15634 |
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