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| Description: Lemma for ruc 4924. If F is any function that maps ℕ into ℝ, then F cannot be onto ℝ. |
| Ref | Expression |
|---|---|
| ruclem.0 | ⊢ F:ℕ–→ℝ |
| ruclem.1 | ⊢ C = ({〈1, 〈((F ‘1) + 1), ((F ‘1) + 2)〉〉} ∪ (F ↾ (ℕ ∖ {1}))) |
| ruclem.2 | ⊢ D = {〈〈x, y〉, z〉∣((x ∈ (ℝ × ℝ) ∧ y ∈ ℝ) ∧ z = if(((1st ‘x) < y ∧ y < (2nd ‘x)), 〈(((2 · y) + (2nd ‘x)) / 3), ((y + (2 · (2nd ‘x))) / 3)〉, 〈(((2 · (1st ‘x)) + (2nd ‘x)) / 3), (((1st ‘x) + (2 · (2nd ‘x))) / 3)〉))} |
| ruclem.3 | ⊢ G = (1st ∘ (DseqC)) |
| ruclem.4 | ⊢ H = (2nd ∘ (DseqC)) |
| ruclem.5 | ⊢ S = sup(ran G, ℝ, < ) |
| Ref | Expression |
|---|---|
| ruclem37 | ⊢ ¬ F:ℕ–onto→ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fveq2 2832 | . . . . . . 7 ⊢ (w = if(w ∈ ℕ, w, 1) → (F ‘w) = (F ‘if(w ∈ ℕ, w, 1))) | |
| 2 | 1 | cleq1d 1109 | . . . . . 6 ⊢ (w = if(w ∈ ℕ, w, 1) → ((F ‘w) = S ↔ (F ‘if(w ∈ ℕ, w, 1)) = S)) |
| 3 | 2 | negbid 463 | . . . . 5 ⊢ (w = if(w ∈ ℕ, w, 1) → (¬ (F ‘w) = S ↔ ¬ (F ‘if(w ∈ ℕ, w, 1)) = S)) |
| 4 | ruclem.0 | . . . . . 6 ⊢ F:ℕ–→ℝ | |
| 5 | ruclem.1 | . . . . . 6 ⊢ C = ({〈1, 〈((F ‘1) + 1), ((F ‘1) + 2)〉〉} ∪ (F ↾ (ℕ ∖ {1}))) | |
| 6 | ruclem.2 | . . . . . 6 ⊢ D = {〈〈x, y〉, z〉∣((x ∈ (ℝ × ℝ) ∧ y ∈ ℝ) ∧ z = if(((1st ‘x) < y ∧ y < (2nd ‘x)), 〈(((2 · y) + (2nd ‘x)) / 3), ((y + (2 · (2nd ‘x))) / 3)〉, 〈(((2 · (1st ‘x)) + (2nd ‘x)) / 3), (((1st ‘x) + (2 · (2nd ‘x))) / 3)〉))} | |
| 7 | ruclem.3 | . . . . . 6 ⊢ G = (1st ∘ (DseqC)) | |
| 8 | ruclem.4 | . . . . . 6 ⊢ H = (2nd ∘ (DseqC)) | |
| 9 | ruclem.5 | . . . . . 6 ⊢ S = sup(ran G, ℝ, < ) | |
| 10 | 1nn 4432 | . . . . . . 7 ⊢ 1 ∈ ℕ | |
| 11 | 10 | elimel 1793 | . . . . . 6 ⊢ if(w ∈ ℕ, w, 1) ∈ ℕ |
| 12 | 4, 5, 6, 7, 8, 9, 11 | ruclem36 4920 | . . . . 5 ⊢ ¬ (F ‘if(w ∈ ℕ, w, 1)) = S |
| 13 | 3, 12 | dedth 1784 | . . . 4 ⊢ (w ∈ ℕ → ¬ (F ‘w) = S) |
| 14 | 13 | nrex 1270 | . . 3 ⊢ ¬ ∃w ∈ ℕ (F ‘w) = S |
| 15 | ffn 2752 | . . . . 5 ⊢ (F:ℕ–→ℝ → F Fn ℕ) | |
| 16 | 4, 15 | ax-mp 6 | . . . 4 ⊢ F Fn ℕ |
| 17 | fvelrn 2883 | . . . 4 ⊢ (F Fn ℕ → (S ∈ ran F ↔ ∃w ∈ ℕ (F ‘w) = S)) | |
| 18 | 16, 17 | ax-mp 6 | . . 3 ⊢ (S ∈ ran F ↔ ∃w ∈ ℕ (F ‘w) = S) |
| 19 | 14, 18 | mtbir 167 | . 2 ⊢ ¬ S ∈ ran F |
| 20 | 4, 5, 6, 7, 8, 9 | ruclem34 4918 | . . 3 ⊢ S ∈ ℝ |
| 21 | forn 2789 | . . . 4 ⊢ (F:ℕ–onto→ℝ → ran F = ℝ) | |
| 22 | 21 | eleq2d 1156 | . . 3 ⊢ (F:ℕ–onto→ℝ → (S ∈ ran F ↔ S ∈ ℝ)) |
| 23 | 20, 22 | mpbiri 169 | . 2 ⊢ (F:ℕ–onto→ℝ → S ∈ ran F) |
| 24 | 19, 23 | mto 93 | 1 ⊢ ¬ F:ℕ–onto→ℝ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 ↔ wb 127 ∧ wa 196 = wceq 1091 ∈ wcel 1092 ∃wrex 1202 ∖ cdif 1484 ∪ cun 1485 ifcif 1776 {csn 1808 〈cop 1810 class class class wbr 2054 supcsup 2060 × cxp 2408 ran crn 2411 ↾ cres 2412 ∘ ccom 2414 Fn wfn 2417 –→wf 2418 –onto→wfo 2420 ‘cfv 2422 (class class class)co 3001 {copab2 3002 1st c1st 3085 2nd c2nd 3086 ℝcr 4027 1c1 4029 + caddc 4031 · cmulc 4032 < clt 4033 / cdiv 4091 ℕcn 4093 2c2 4454 3c3 4455 seqcseq 4660 |
| This theorem is referenced by: ruclem38 4922 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-un 1076 ax-pow 1077 ax-reg 1078 ax-inf 1079 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3or 582 df-3an 583 df-ex 679 df-sb 853 df-eu 1009 df-mo 1010 df-clab 1093 df-cleq 1097 df-clel 1099 df-ne 1192 df-ral 1205 df-rex 1206 df-reu 1207 df-rab 1208 df-v 1349 df-sbc 1441 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-pss 1494 df-nul 1708 df-if 1777 df-pw 1799 df-sn 1811 df-pr 1812 df-tp 1814 df-op 1815 df-uni 1920 df-int 1966 df-iun 1996 df-tr 2042 df-br 2063 df-opab 2098 df-eprel 2122 df-id 2125 df-po 2128 df-so 2138 df-sup 2154 df-fr 2169 df-we 2186 df-ord 2202 df-on 2203 df-lim 2204 df-suc 2205 df-om 2373 df-xp 2424 df-rel 2425 df-cnv 2426 df-co 2427 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fun 2432 df-fn 2433 df-f 2434 df-f1 2435 df-fo 2436 df-f1o 2437 df-fv 2438 df-rdg 2970 df-opr 3003 df-oprab 3004 df-1st 3087 df-2nd 3088 df-1o 3104 df-oadd 3106 df-omul 3107 df-er 3200 df-ec 3202 df-qs 3205 df-ni 3794 df-pli 3795 df-mi 3796 df-lti 3797 df-plpq 3829 df-mpq 3830 df-enq 3831 df-nq 3832 df-plq 3833 df-mq 3834 df-rq 3835 df-ltq 3836 df-1q 3837 df-np 3880 df-1p 3881 df-plp 3882 df-mp 3883 df-ltp 3884 df-plpr 3958 df-mpr 3959 df-enr 3960 df-nr 3961 df-plr 3962 df-mr 3963 df-ltr 3964 df-0r 3965 df-1r 3966 df-m1r 3967 df-c 4034 df-0 4035 df-1 4036 df-r 4038 df-plus 4039 df-mul 4040 df-lt 4041 df-sub 4133 df-neg 4135 df-div 4216 df-le 4277 df-n 4423 df-2 4462 df-3 4463 df-n0 4535 df-z 4564 df-seq 4661 |