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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 15381 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 12897 | . . . 4 ⊢ (ℤ≥‘𝑀) ⊆ ℤ | |
3 | 1, 2 | eqsstri 4030 | . . 3 ⊢ 𝑍 ⊆ ℤ |
4 | id 22 | . . 3 ⊢ ((𝐹‘𝑘) ∈ ℂ → (𝐹‘𝑘) ∈ ℂ) | |
5 | eleq1 2827 | . . 3 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑗) → ((𝐹‘𝑘) ∈ ℂ ↔ (𝐹‘𝑗) ∈ ℂ)) | |
6 | eleq1 2827 | . . 3 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑚) → ((𝐹‘𝑘) ∈ ℂ ↔ (𝐹‘𝑚) ∈ ℂ)) | |
7 | abssub 15362 | . . . 4 ⊢ (((𝐹‘𝑗) ∈ ℂ ∧ (𝐹‘𝑘) ∈ ℂ) → (abs‘((𝐹‘𝑗) − (𝐹‘𝑘))) = (abs‘((𝐹‘𝑘) − (𝐹‘𝑗)))) | |
8 | 7 | 3adant1 1129 | . . 3 ⊢ ((⊤ ∧ (𝐹‘𝑗) ∈ ℂ ∧ (𝐹‘𝑘) ∈ ℂ) → (abs‘((𝐹‘𝑗) − (𝐹‘𝑘))) = (abs‘((𝐹‘𝑘) − (𝐹‘𝑗)))) |
9 | abssub 15362 | . . . 4 ⊢ (((𝐹‘𝑚) ∈ ℂ ∧ (𝐹‘𝑗) ∈ ℂ) → (abs‘((𝐹‘𝑚) − (𝐹‘𝑗))) = (abs‘((𝐹‘𝑗) − (𝐹‘𝑚)))) | |
10 | 9 | 3adant1 1129 | . . 3 ⊢ ((⊤ ∧ (𝐹‘𝑚) ∈ ℂ ∧ (𝐹‘𝑗) ∈ ℂ) → (abs‘((𝐹‘𝑚) − (𝐹‘𝑗))) = (abs‘((𝐹‘𝑗) − (𝐹‘𝑚)))) |
11 | abs3lem 15374 | . . . 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 1129 | . . 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 15390 | . 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 1544 | 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 1537 ⊤wtru 1538 ∈ wcel 2106 ∀wral 3059 ∃wrex 3068 class class class wbr 5148 ‘cfv 6563 (class class class)co 7431 ℂcc 11151 ℝcr 11152 < clt 11293 − cmin 11490 / cdiv 11918 2c2 12319 ℤcz 12611 ℤ≥cuz 12876 ℝ+crp 13032 abscabs 15270 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 ax-pre-sup 11231 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-2nd 8014 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-sup 9480 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-div 11919 df-nn 12265 df-2 12327 df-3 12328 df-n0 12525 df-z 12612 df-uz 12877 df-rp 13033 df-seq 14040 df-exp 14100 df-cj 15135 df-re 15136 df-im 15137 df-sqrt 15271 df-abs 15272 |
This theorem is referenced by: cau4 15392 serf0 15714 |
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