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Theorem enrelmap 42343
Description: The set of all possible relations between two sets is equinumerous to the set of all mappings from one set to the powerset of the other. See rfovf1od 42352 for a demonstration of a natural one-to-one onto mapping. (Contributed by RP, 27-Apr-2021.)
Assertion
Ref Expression
enrelmap ((𝐴𝑉𝐵𝑊) → 𝒫 (𝐴 × 𝐵) ≈ (𝒫 𝐵m 𝐴))

Proof of Theorem enrelmap
StepHypRef Expression
1 xpcomeng 9015 . . . 4 ((𝐴𝑉𝐵𝑊) → (𝐴 × 𝐵) ≈ (𝐵 × 𝐴))
2 pwen 9101 . . . 4 ((𝐴 × 𝐵) ≈ (𝐵 × 𝐴) → 𝒫 (𝐴 × 𝐵) ≈ 𝒫 (𝐵 × 𝐴))
31, 2syl 17 . . 3 ((𝐴𝑉𝐵𝑊) → 𝒫 (𝐴 × 𝐵) ≈ 𝒫 (𝐵 × 𝐴))
4 xpexg 7689 . . . . 5 ((𝐵𝑊𝐴𝑉) → (𝐵 × 𝐴) ∈ V)
54ancoms 460 . . . 4 ((𝐴𝑉𝐵𝑊) → (𝐵 × 𝐴) ∈ V)
6 pw2eng 9029 . . . 4 ((𝐵 × 𝐴) ∈ V → 𝒫 (𝐵 × 𝐴) ≈ (2om (𝐵 × 𝐴)))
75, 6syl 17 . . 3 ((𝐴𝑉𝐵𝑊) → 𝒫 (𝐵 × 𝐴) ≈ (2om (𝐵 × 𝐴)))
8 entr 8953 . . 3 ((𝒫 (𝐴 × 𝐵) ≈ 𝒫 (𝐵 × 𝐴) ∧ 𝒫 (𝐵 × 𝐴) ≈ (2om (𝐵 × 𝐴))) → 𝒫 (𝐴 × 𝐵) ≈ (2om (𝐵 × 𝐴)))
93, 7, 8syl2anc 585 . 2 ((𝐴𝑉𝐵𝑊) → 𝒫 (𝐴 × 𝐵) ≈ (2om (𝐵 × 𝐴)))
10 pw2eng 9029 . . . . 5 (𝐵𝑊 → 𝒫 𝐵 ≈ (2om 𝐵))
11 enrefg 8931 . . . . 5 (𝐴𝑉𝐴𝐴)
12 mapen 9092 . . . . 5 ((𝒫 𝐵 ≈ (2om 𝐵) ∧ 𝐴𝐴) → (𝒫 𝐵m 𝐴) ≈ ((2om 𝐵) ↑m 𝐴))
1310, 11, 12syl2anr 598 . . . 4 ((𝐴𝑉𝐵𝑊) → (𝒫 𝐵m 𝐴) ≈ ((2om 𝐵) ↑m 𝐴))
14 2on 8431 . . . . 5 2o ∈ On
15 simpr 486 . . . . 5 ((𝐴𝑉𝐵𝑊) → 𝐵𝑊)
16 simpl 484 . . . . 5 ((𝐴𝑉𝐵𝑊) → 𝐴𝑉)
17 mapxpen 9094 . . . . 5 ((2o ∈ On ∧ 𝐵𝑊𝐴𝑉) → ((2om 𝐵) ↑m 𝐴) ≈ (2om (𝐵 × 𝐴)))
1814, 15, 16, 17mp3an2i 1467 . . . 4 ((𝐴𝑉𝐵𝑊) → ((2om 𝐵) ↑m 𝐴) ≈ (2om (𝐵 × 𝐴)))
19 entr 8953 . . . 4 (((𝒫 𝐵m 𝐴) ≈ ((2om 𝐵) ↑m 𝐴) ∧ ((2om 𝐵) ↑m 𝐴) ≈ (2om (𝐵 × 𝐴))) → (𝒫 𝐵m 𝐴) ≈ (2om (𝐵 × 𝐴)))
2013, 18, 19syl2anc 585 . . 3 ((𝐴𝑉𝐵𝑊) → (𝒫 𝐵m 𝐴) ≈ (2om (𝐵 × 𝐴)))
2120ensymd 8952 . 2 ((𝐴𝑉𝐵𝑊) → (2om (𝐵 × 𝐴)) ≈ (𝒫 𝐵m 𝐴))
22 entr 8953 . 2 ((𝒫 (𝐴 × 𝐵) ≈ (2om (𝐵 × 𝐴)) ∧ (2om (𝐵 × 𝐴)) ≈ (𝒫 𝐵m 𝐴)) → 𝒫 (𝐴 × 𝐵) ≈ (𝒫 𝐵m 𝐴))
239, 21, 22syl2anc 585 1 ((𝐴𝑉𝐵𝑊) → 𝒫 (𝐴 × 𝐵) ≈ (𝒫 𝐵m 𝐴))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 397  wcel 2107  Vcvv 3448  𝒫 cpw 4565   class class class wbr 5110   × cxp 5636  Oncon0 6322  (class class class)co 7362  2oc2o 8411  m cmap 8772  cen 8887
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2708  ax-sep 5261  ax-nul 5268  ax-pow 5325  ax-pr 5389  ax-un 7677
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2815  df-nfc 2890  df-ne 2945  df-ral 3066  df-rex 3075  df-rab 3411  df-v 3450  df-sbc 3745  df-csb 3861  df-dif 3918  df-un 3920  df-in 3922  df-ss 3932  df-pss 3934  df-nul 4288  df-if 4492  df-pw 4567  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4871  df-iun 4961  df-br 5111  df-opab 5173  df-mpt 5194  df-tr 5228  df-id 5536  df-eprel 5542  df-po 5550  df-so 5551  df-fr 5593  df-we 5595  df-xp 5644  df-rel 5645  df-cnv 5646  df-co 5647  df-dm 5648  df-rn 5649  df-res 5650  df-ima 5651  df-ord 6325  df-on 6326  df-lim 6327  df-suc 6328  df-iota 6453  df-fun 6503  df-fn 6504  df-f 6505  df-f1 6506  df-fo 6507  df-f1o 6508  df-fv 6509  df-ov 7365  df-oprab 7366  df-mpo 7367  df-om 7808  df-1st 7926  df-2nd 7927  df-1o 8417  df-2o 8418  df-er 8655  df-map 8774  df-en 8891
This theorem is referenced by:  enrelmapr  42344  enmappw  42345
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