Theorem pwfi2en 43543

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 2737	. . 3 ⊢ (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o})) = (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o}))
3	1, 2	pwfi2f1o 43542	. 2 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o})):𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin))
4		ovex 7393	. . . 4 ⊢ (2o ↑m 𝐴) ∈ V
5	1, 4	rabex2 5278	. . 3 ⊢ 𝑆 ∈ V
6	5	f1oen 8912	. 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 3390   ∩ cin 3889  ∅c0 4274  𝒫 cpw 4542  {csn 4568   class class class wbr 5086   ↦ cmpt 5167  ^◡ccnv 5623   “ cima 5627  –1-1-onto→wf1o 6491  (class class class)co 7360  1_oc1o 8391  2_oc2o 8392   ↑_m cmap 8766   ≈ cen 8883  Fincfn 8886   finSupp cfsupp 9267

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 2709  ax-rep 5212  ax-sep 5231  ax-nul 5241  ax-pow 5302  ax-pr 5370  ax-un 7682

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 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-reu 3344  df-rab 3391  df-v 3432  df-sbc 3730  df-csb 3839  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-pss 3910  df-nul 4275  df-if 4468  df-pw 4544  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-iun 4936  df-br 5087  df-opab 5149  df-mpt 5168  df-tr 5194  df-id 5519  df-eprel 5524  df-po 5532  df-so 5533  df-fr 5577  df-we 5579  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-ord 6320  df-on 6321  df-suc 6323  df-iota 6448  df-fun 6494  df-fn 6495  df-f 6496  df-f1 6497  df-fo 6498  df-f1o 6499  df-fv 6500  df-ov 7363  df-oprab 7364  df-mpo 7365  df-1st 7935  df-2nd 7936  df-supp 8104  df-1o 8398  df-2o 8399  df-map 8768  df-en 8887  df-fsupp 9268

This theorem is referenced by:  frlmpwfi  43544