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| Mirrors > Home > MPE Home > Th. List > Mathboxes > hashomiso | Structured version Visualization version GIF version | ||
| Description: The ♯ function yields an order isomorphism between ω and ℕ0. (Contributed by Eric Schmidt, 7-Jul-2026.) |
| Ref | Expression |
|---|---|
| hashomiso | ⊢ (♯ ↾ ω) Isom E , < (ω, ℕ0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hashomf1o 46121 | . 2 ⊢ (♯ ↾ ω):ω–1-1-onto→ℕ0 | |
| 2 | epel 5553 | . . . . 5 ⊢ (𝑥 E 𝑦 ↔ 𝑥 ∈ 𝑦) | |
| 3 | hashnnltb 46120 | . . . . 5 ⊢ ((𝑥 ∈ ω ∧ 𝑦 ∈ ω) → (𝑥 ∈ 𝑦 ↔ (♯‘𝑥) < (♯‘𝑦))) | |
| 4 | 2, 3 | bitrid 286 | . . . 4 ⊢ ((𝑥 ∈ ω ∧ 𝑦 ∈ ω) → (𝑥 E 𝑦 ↔ (♯‘𝑥) < (♯‘𝑦))) |
| 5 | fvres 6907 | . . . . 5 ⊢ (𝑥 ∈ ω → ((♯ ↾ ω)‘𝑥) = (♯‘𝑥)) | |
| 6 | fvres 6907 | . . . . 5 ⊢ (𝑦 ∈ ω → ((♯ ↾ ω)‘𝑦) = (♯‘𝑦)) | |
| 7 | 5, 6 | breqan12d 5118 | . . . 4 ⊢ ((𝑥 ∈ ω ∧ 𝑦 ∈ ω) → (((♯ ↾ ω)‘𝑥) < ((♯ ↾ ω)‘𝑦) ↔ (♯‘𝑥) < (♯‘𝑦))) |
| 8 | 4, 7 | bitr4d 285 | . . 3 ⊢ ((𝑥 ∈ ω ∧ 𝑦 ∈ ω) → (𝑥 E 𝑦 ↔ ((♯ ↾ ω)‘𝑥) < ((♯ ↾ ω)‘𝑦))) |
| 9 | 8 | rgen2 3202 | . 2 ⊢ ∀𝑥 ∈ ω ∀𝑦 ∈ ω (𝑥 E 𝑦 ↔ ((♯ ↾ ω)‘𝑥) < ((♯ ↾ ω)‘𝑦)) |
| 10 | df-isom 6550 | . 2 ⊢ ((♯ ↾ ω) Isom E , < (ω, ℕ0) ↔ ((♯ ↾ ω):ω–1-1-onto→ℕ0 ∧ ∀𝑥 ∈ ω ∀𝑦 ∈ ω (𝑥 E 𝑦 ↔ ((♯ ↾ ω)‘𝑥) < ((♯ ↾ ω)‘𝑦)))) | |
| 11 | 1, 9, 10 | mpbir2an 724 | 1 ⊢ (♯ ↾ ω) Isom E , < (ω, ℕ0) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 ∈ wcel 2144 ∀wral 3076 class class class wbr 5102 E cep 5549 ↾ cres 5652 –1-1-onto→wf1o 6540 ‘cfv 6541 Isom wiso 6542 ωcom 7879 < clt 11348 ℕ0cn0 12611 ♯chash 14479 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7753 ax-cnex 11261 ax-resscn 11262 ax-1cn 11263 ax-icn 11264 ax-addcl 11265 ax-addrcl 11266 ax-mulcl 11267 ax-mulrcl 11268 ax-mulcom 11269 ax-addass 11270 ax-mulass 11271 ax-distr 11272 ax-i2m1 11273 ax-1ne0 11274 ax-1rid 11275 ax-rnegex 11276 ax-rrecex 11277 ax-cnre 11278 ax-pre-lttri 11279 ax-pre-lttrn 11280 ax-pre-ltadd 11281 ax-pre-mulgt0 11282 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-isom 6550 df-riota 7379 df-ov 7425 df-oprab 7426 df-mpo 7427 df-om 7880 df-1st 8003 df-2nd 8004 df-frecs 8304 df-wrecs 8335 df-recs 8384 df-rdg 8423 df-1o 8481 df-oadd 8485 df-er 8722 df-en 8979 df-dom 8980 df-sdom 8981 df-fin 8982 df-card 10025 df-pnf 11350 df-mnf 11351 df-xr 11352 df-ltxr 11353 df-le 11354 df-sub 11548 df-neg 11549 df-nn 12341 df-n0 12612 df-xnn0 12685 df-z 12699 df-uz 12971 df-fz 13645 df-hash 14480 |
| This theorem is used by: (None) |
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