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| Mirrors > Home > ILE Home > Th. List > Mathboxes > 2omapen | GIF version | ||
| Description: Equinumerosity of (2o ↑𝑚 𝐴) and the set of decidable subsets of 𝐴. (Contributed by Jim Kingdon, 14-Nov-2025.) |
| Ref | Expression |
|---|---|
| 2omapen | ⊢ (𝐴 ∈ 𝑉 → (2o ↑𝑚 𝐴) ≈ {𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦 ∈ 𝐴 DECID 𝑦 ∈ 𝑥}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fnmap 6829 | . . 3 ⊢ ↑𝑚 Fn (V × V) | |
| 2 | 2onn 6694 | . . . 4 ⊢ 2o ∈ ω | |
| 3 | 2 | elexi 2814 | . . 3 ⊢ 2o ∈ V |
| 4 | elex 2813 | . . 3 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ V) | |
| 5 | fnovex 6056 | . . 3 ⊢ (( ↑𝑚 Fn (V × V) ∧ 2o ∈ V ∧ 𝐴 ∈ V) → (2o ↑𝑚 𝐴) ∈ V) | |
| 6 | 1, 3, 4, 5 | mp3an12i 1377 | . 2 ⊢ (𝐴 ∈ 𝑉 → (2o ↑𝑚 𝐴) ∈ V) |
| 7 | eqid 2230 | . . 3 ⊢ (𝑠 ∈ (2o ↑𝑚 𝐴) ↦ {𝑧 ∈ 𝐴 ∣ (𝑠‘𝑧) = 1o}) = (𝑠 ∈ (2o ↑𝑚 𝐴) ↦ {𝑧 ∈ 𝐴 ∣ (𝑠‘𝑧) = 1o}) | |
| 8 | 7 | 2omap 16654 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝑠 ∈ (2o ↑𝑚 𝐴) ↦ {𝑧 ∈ 𝐴 ∣ (𝑠‘𝑧) = 1o}):(2o ↑𝑚 𝐴)–1-1-onto→{𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦 ∈ 𝐴 DECID 𝑦 ∈ 𝑥}) |
| 9 | f1oeng 6935 | . 2 ⊢ (((2o ↑𝑚 𝐴) ∈ V ∧ (𝑠 ∈ (2o ↑𝑚 𝐴) ↦ {𝑧 ∈ 𝐴 ∣ (𝑠‘𝑧) = 1o}):(2o ↑𝑚 𝐴)–1-1-onto→{𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦 ∈ 𝐴 DECID 𝑦 ∈ 𝑥}) → (2o ↑𝑚 𝐴) ≈ {𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦 ∈ 𝐴 DECID 𝑦 ∈ 𝑥}) | |
| 10 | 6, 8, 9 | syl2anc 411 | 1 ⊢ (𝐴 ∈ 𝑉 → (2o ↑𝑚 𝐴) ≈ {𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦 ∈ 𝐴 DECID 𝑦 ∈ 𝑥}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 DECID wdc 841 = wceq 1397 ∈ wcel 2201 ∀wral 2509 {crab 2513 Vcvv 2801 𝒫 cpw 3653 class class class wbr 4089 ↦ cmpt 4151 ωcom 4690 × cxp 4725 Fn wfn 5323 –1-1-onto→wf1o 5327 ‘cfv 5328 (class class class)co 6023 1oc1o 6580 2oc2o 6581 ↑𝑚 cmap 6822 ≈ cen 6912 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2203 ax-14 2204 ax-ext 2212 ax-coll 4205 ax-sep 4208 ax-nul 4216 ax-pow 4266 ax-pr 4301 ax-un 4532 ax-setind 4637 ax-iinf 4688 |
| This theorem depends on definitions: df-bi 117 df-dc 842 df-3or 1005 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ne 2402 df-ral 2514 df-rex 2515 df-reu 2516 df-rab 2518 df-v 2803 df-sbc 3031 df-csb 3127 df-dif 3201 df-un 3203 df-in 3205 df-ss 3212 df-nul 3494 df-if 3605 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-uni 3895 df-int 3930 df-iun 3973 df-br 4090 df-opab 4152 df-mpt 4153 df-tr 4189 df-id 4392 df-iord 4465 df-on 4467 df-suc 4470 df-iom 4691 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-rn 4738 df-res 4739 df-ima 4740 df-iota 5288 df-fun 5330 df-fn 5331 df-f 5332 df-f1 5333 df-fo 5334 df-f1o 5335 df-fv 5336 df-ov 6026 df-oprab 6027 df-mpo 6028 df-1st 6308 df-2nd 6309 df-1o 6587 df-2o 6588 df-map 6824 df-en 6915 |
| This theorem is referenced by: (None) |
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