| Mathbox for Glauco Siliprandi |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > 0cnv | Structured version Visualization version GIF version | ||
| Description: If ∅ is a complex number, then it converges to itself. See 0ncn 11145 and its comment; see also the comment in climlimsupcex 46584. (Contributed by Glauco Siliprandi, 2-Jan-2022.) |
| Ref | Expression |
|---|---|
| 0cnv | ⊢ (∅ ∈ ℂ → ∅ ⇝ ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 23 | . . 3 ⊢ (∅ ∈ ℂ → ∅ ∈ ℂ) | |
| 2 | 0zd 12630 | . . . . 5 ⊢ ((∅ ∈ ℂ ∧ 𝑥 ∈ ℝ+) → 0 ∈ ℤ) | |
| 3 | simpl 488 | . . . . . . 7 ⊢ ((∅ ∈ ℂ ∧ 𝑥 ∈ ℝ+) → ∅ ∈ ℂ) | |
| 4 | subid 11504 | . . . . . . . . . . 11 ⊢ (∅ ∈ ℂ → (∅ − ∅) = 0) | |
| 5 | 4 | fveq2d 6886 | . . . . . . . . . 10 ⊢ (∅ ∈ ℂ → (abs‘(∅ − ∅)) = (abs‘0)) |
| 6 | abs0 15374 | . . . . . . . . . . 11 ⊢ (abs‘0) = 0 | |
| 7 | 6 | a1i 11 | . . . . . . . . . 10 ⊢ (∅ ∈ ℂ → (abs‘0) = 0) |
| 8 | 5, 7 | eqtrd 2797 | . . . . . . . . 9 ⊢ (∅ ∈ ℂ → (abs‘(∅ − ∅)) = 0) |
| 9 | 8 | adantr 486 | . . . . . . . 8 ⊢ ((∅ ∈ ℂ ∧ 𝑥 ∈ ℝ+) → (abs‘(∅ − ∅)) = 0) |
| 10 | rpgt0 13057 | . . . . . . . . 9 ⊢ (𝑥 ∈ ℝ+ → 0 < 𝑥) | |
| 11 | 10 | adantl 487 | . . . . . . . 8 ⊢ ((∅ ∈ ℂ ∧ 𝑥 ∈ ℝ+) → 0 < 𝑥) |
| 12 | 9, 11 | eqbrtrd 5131 | . . . . . . 7 ⊢ ((∅ ∈ ℂ ∧ 𝑥 ∈ ℝ+) → (abs‘(∅ − ∅)) < 𝑥) |
| 13 | 3, 12 | jca 521 | . . . . . 6 ⊢ ((∅ ∈ ℂ ∧ 𝑥 ∈ ℝ+) → (∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥)) |
| 14 | 13 | ralrimivw 3160 | . . . . 5 ⊢ ((∅ ∈ ℂ ∧ 𝑥 ∈ ℝ+) → ∀𝑘 ∈ (ℤ≥‘0)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥)) |
| 15 | fveq2 6882 | . . . . . . 7 ⊢ (𝑚 = 0 → (ℤ≥‘𝑚) = (ℤ≥‘0)) | |
| 16 | 15 | raleqdv 3321 | . . . . . 6 ⊢ (𝑚 = 0 → (∀𝑘 ∈ (ℤ≥‘𝑚)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥) ↔ ∀𝑘 ∈ (ℤ≥‘0)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥))) |
| 17 | 16 | rspcev 3579 | . . . . 5 ⊢ ((0 ∈ ℤ ∧ ∀𝑘 ∈ (ℤ≥‘0)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥)) → ∃𝑚 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑚)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥)) |
| 18 | 2, 14, 17 | syl2anc 596 | . . . 4 ⊢ ((∅ ∈ ℂ ∧ 𝑥 ∈ ℝ+) → ∃𝑚 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑚)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥)) |
| 19 | 18 | ralrimiva 3156 | . . 3 ⊢ (∅ ∈ ℂ → ∀𝑥 ∈ ℝ+ ∃𝑚 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑚)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥)) |
| 20 | 1, 19 | jca 521 | . 2 ⊢ (∅ ∈ ℂ → (∅ ∈ ℂ ∧ ∀𝑥 ∈ ℝ+ ∃𝑚 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑚)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥))) |
| 21 | 0ex 5268 | . . . . 5 ⊢ ∅ ∈ V | |
| 22 | 21 | a1i 11 | . . . 4 ⊢ (⊤ → ∅ ∈ V) |
| 23 | 0fv 6923 | . . . . 5 ⊢ (∅‘𝑘) = ∅ | |
| 24 | 23 | a1i 11 | . . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℤ) → (∅‘𝑘) = ∅) |
| 25 | 22, 24 | clim 15583 | . . 3 ⊢ (⊤ → (∅ ⇝ ∅ ↔ (∅ ∈ ℂ ∧ ∀𝑥 ∈ ℝ+ ∃𝑚 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑚)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥)))) |
| 26 | 25 | mptru 1577 | . 2 ⊢ (∅ ⇝ ∅ ↔ (∅ ∈ ℂ ∧ ∀𝑥 ∈ ℝ+ ∃𝑚 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑚)(∅ ∈ ℂ ∧ (abs‘(∅ − ∅)) < 𝑥))) |
| 27 | 20, 26 | sylibr 237 | 1 ⊢ (∅ ∈ ℂ → ∅ ⇝ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ⊤wtru 1571 ∈ wcel 2145 ∀wral 3078 ∃wrex 3088 Vcvv 3453 ∅c0 4282 class class class wbr 5107 ‘cfv 6537 (class class class)co 7416 ℂcc 11125 0cc0 11127 < clt 11270 − cmin 11468 ℤcz 12618 ℤ≥cuz 12890 ℝ+crp 13044 abscabs 15323 ⇝ cli 15573 |
| 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 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 |
| 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 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7866 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8699 df-en 8956 df-dom 8957 df-sdom 8958 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-div 11899 df-nn 12261 df-2 12330 df-n0 12532 df-z 12619 df-uz 12891 df-rp 13045 df-seq 14068 df-exp 14128 df-cj 15188 df-re 15189 df-im 15190 df-sqrt 15324 df-abs 15325 df-clim 15577 |
| This theorem is used by: climlimsupcex 46584 |
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