Theorem pwfi2en 43525

Description: Finitely supported indicator functions are equinumerous to finite subsets. MOVABLE (Contributed by Stefan O'Rear, 10-Jul-2015.) (Revised by AV, 14-Jun-2020.)

Hypothesis

Ref	Expression
pwfi2en.s	⊢ 𝑆 = {𝑦 ∈ (2o ↑m 𝐴) ∣ 𝑦 finSupp ∅}

Assertion

Ref	Expression
pwfi2en	⊢ (𝐴 ∈ 𝑉 → 𝑆 ≈ (𝒫 𝐴 ∩ Fin))

Distinct variable groups:   𝑦,𝐴   𝑦,𝑉

Allowed substitution hint:   𝑆(𝑦)

Proof of Theorem pwfi2en

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		pwfi2en.s	. . 3 ⊢ 𝑆 = {𝑦 ∈ (2o ↑m 𝐴) ∣ 𝑦 finSupp ∅}
2		eqid 2736	. . 3 ⊢ (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o})) = (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o}))
3	1, 2	pwfi2f1o 43524	. 2 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o})):𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin))
4		ovex 7400	. . . 4 ⊢ (2o ↑m 𝐴) ∈ V
5	1, 4	rabex2 5282	. . 3 ⊢ 𝑆 ∈ V
6	5	f1oen 8919	. 2 ⊢ ((𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o})):𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin) → 𝑆 ≈ (𝒫 𝐴 ∩ Fin))
7	3, 6	syl 17	1 ⊢ (𝐴 ∈ 𝑉 → 𝑆 ≈ (𝒫 𝐴 ∩ Fin))

Syntax hints:   → wi 4   = wceq 1542   ∈ wcel 2114  {crab 3389   ∩ cin 3888  ∅c0 4273  𝒫 cpw 4541  {csn 4567   class class class wbr 5085   ↦ cmpt 5166  ^◡ccnv 5630   “ cima 5634  –1-1-onto→wf1o 6497  (class class class)co 7367  1_oc1o 8398  2_oc2o 8399   ↑_m cmap 8773   ≈ cen 8890  Fincfn 8893   finSupp cfsupp 9274

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-rep 5212  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375  ax-un 7689

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-reu 3343  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-pss 3909  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-iun 4935  df-br 5086  df-opab 5148  df-mpt 5167  df-tr 5193  df-id 5526  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-we 5586  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-ord 6326  df-on 6327  df-suc 6329  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-f1 6503  df-fo 6504  df-f1o 6505  df-fv 6506  df-ov 7370  df-oprab 7371  df-mpo 7372  df-1st 7942  df-2nd 7943  df-supp 8111  df-1o 8405  df-2o 8406  df-map 8775  df-en 8894  df-fsupp 9275

This theorem is referenced by:  frlmpwfi  43526