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| Mirrors > Home > ILE Home > Th. List > cau3 | 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 11704 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 9897 | . . . 4 ⊢ (ℤ≥‘𝑀) ⊆ ℤ | |
| 3 | 1, 2 | eqsstri 3274 | . . 3 ⊢ 𝑍 ⊆ ℤ |
| 4 | id 19 | . . 3 ⊢ ((𝐹‘𝑘) ∈ ℂ → (𝐹‘𝑘) ∈ ℂ) | |
| 5 | eleq1 2297 | . . 3 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑗) → ((𝐹‘𝑘) ∈ ℂ ↔ (𝐹‘𝑗) ∈ ℂ)) | |
| 6 | eleq1 2297 | . . 3 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑚) → ((𝐹‘𝑘) ∈ ℂ ↔ (𝐹‘𝑚) ∈ ℂ)) | |
| 7 | abssub 11817 | . . . 4 ⊢ (((𝐹‘𝑗) ∈ ℂ ∧ (𝐹‘𝑘) ∈ ℂ) → (abs‘((𝐹‘𝑗) − (𝐹‘𝑘))) = (abs‘((𝐹‘𝑘) − (𝐹‘𝑗)))) | |
| 8 | 7 | 3adant1 1042 | . . 3 ⊢ ((⊤ ∧ (𝐹‘𝑗) ∈ ℂ ∧ (𝐹‘𝑘) ∈ ℂ) → (abs‘((𝐹‘𝑗) − (𝐹‘𝑘))) = (abs‘((𝐹‘𝑘) − (𝐹‘𝑗)))) |
| 9 | abssub 11817 | . . . 4 ⊢ (((𝐹‘𝑚) ∈ ℂ ∧ (𝐹‘𝑗) ∈ ℂ) → (abs‘((𝐹‘𝑚) − (𝐹‘𝑗))) = (abs‘((𝐹‘𝑗) − (𝐹‘𝑚)))) | |
| 10 | 9 | 3adant1 1042 | . . 3 ⊢ ((⊤ ∧ (𝐹‘𝑚) ∈ ℂ ∧ (𝐹‘𝑗) ∈ ℂ) → (abs‘((𝐹‘𝑚) − (𝐹‘𝑗))) = (abs‘((𝐹‘𝑗) − (𝐹‘𝑚)))) |
| 11 | abs3lem 11827 | . . . 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 1042 | . . 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 11830 | . 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 1407 | 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 set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1398 ⊤wtru 1399 ∈ wcel 2205 ∀wral 2522 ∃wrex 2523 class class class wbr 4115 ‘cfv 5359 (class class class)co 6060 ℂcc 8143 ℝcr 8144 < clt 8326 − cmin 8463 / cdiv 8968 2c2 9310 ℤcz 9599 ℤ≥cuz 9876 ℝ+crp 10009 abscabs 11713 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2208 ax-ext 2216 ax-coll 4231 ax-sep 4234 ax-nul 4242 ax-pow 4293 ax-pr 4328 ax-un 4560 ax-setind 4666 ax-iinf 4717 ax-cnex 8236 ax-resscn 8237 ax-1cn 8238 ax-1re 8239 ax-icn 8240 ax-addcl 8241 ax-addrcl 8242 ax-mulcl 8243 ax-mulrcl 8244 ax-addcom 8245 ax-mulcom 8246 ax-addass 8247 ax-mulass 8248 ax-distr 8249 ax-i2m1 8250 ax-0lt1 8251 ax-1rid 8252 ax-0id 8253 ax-rnegex 8254 ax-precex 8255 ax-cnre 8256 ax-pre-ltirr 8257 ax-pre-ltwlin 8258 ax-pre-lttrn 8259 ax-pre-apti 8260 ax-pre-ltadd 8261 ax-pre-mulgt0 8262 ax-pre-mulext 8263 ax-arch 8264 ax-caucvg 8265 |
| This theorem depends on definitions: df-bi 117 df-dc 843 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-reu 2529 df-rmo 2530 df-rab 2531 df-v 2817 df-sbc 3046 df-csb 3142 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-nul 3513 df-if 3626 df-pw 3677 df-sn 3701 df-pr 3702 df-op 3704 df-uni 3921 df-int 3956 df-iun 3999 df-br 4116 df-opab 4178 df-mpt 4179 df-tr 4215 df-id 4420 df-po 4423 df-iso 4424 df-iord 4493 df-on 4495 df-ilim 4496 df-suc 4498 df-iom 4720 df-xp 4762 df-rel 4763 df-cnv 4764 df-co 4765 df-dm 4766 df-rn 4767 df-res 4768 df-ima 4769 df-iota 5319 df-fun 5361 df-fn 5362 df-f 5363 df-f1 5364 df-fo 5365 df-f1o 5366 df-fv 5367 df-riota 6013 df-ov 6063 df-oprab 6064 df-mpo 6065 df-1st 6349 df-2nd 6350 df-recs 6551 df-frec 6637 df-pnf 8328 df-mnf 8329 df-xr 8330 df-ltxr 8331 df-le 8332 df-sub 8465 df-neg 8466 df-reap 8869 df-ap 8876 df-div 8969 df-inn 9260 df-2 9318 df-3 9319 df-4 9320 df-n0 9519 df-z 9600 df-uz 9877 df-rp 10010 df-seqfrec 10839 df-exp 10930 df-cj 11557 df-re 11558 df-im 11559 df-rsqrt 11714 df-abs 11715 |
| This theorem is referenced by: cau4 11832 serf0 12068 |
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