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Theorem pwfi2en 41236
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 ∈ (2om 𝐴) ∣ 𝑦 finSupp ∅}
Assertion
Ref Expression
pwfi2en (𝐴𝑉𝑆 ≈ (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.
StepHypRef Expression
1 pwfi2en.s . . 3 𝑆 = {𝑦 ∈ (2om 𝐴) ∣ 𝑦 finSupp ∅}
2 eqid 2736 . . 3 (𝑥𝑆 ↦ (𝑥 “ {1o})) = (𝑥𝑆 ↦ (𝑥 “ {1o}))
31, 2pwfi2f1o 41235 . 2 (𝐴𝑉 → (𝑥𝑆 ↦ (𝑥 “ {1o})):𝑆1-1-onto→(𝒫 𝐴 ∩ Fin))
4 ovex 7371 . . . 4 (2om 𝐴) ∈ V
51, 4rabex2 5279 . . 3 𝑆 ∈ V
65f1oen 8835 . 2 ((𝑥𝑆 ↦ (𝑥 “ {1o})):𝑆1-1-onto→(𝒫 𝐴 ∩ Fin) → 𝑆 ≈ (𝒫 𝐴 ∩ Fin))
73, 6syl 17 1 (𝐴𝑉𝑆 ≈ (𝒫 𝐴 ∩ Fin))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1540  wcel 2105  {crab 3403  cin 3897  c0 4270  𝒫 cpw 4548  {csn 4574   class class class wbr 5093  cmpt 5176  ccnv 5620  cima 5624  1-1-ontowf1o 6479  (class class class)co 7338  1oc1o 8361  2oc2o 8362  m cmap 8687  cen 8802  Fincfn 8805   finSupp cfsupp 9227
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2707  ax-rep 5230  ax-sep 5244  ax-nul 5251  ax-pow 5309  ax-pr 5373  ax-un 7651
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2538  df-eu 2567  df-clab 2714  df-cleq 2728  df-clel 2814  df-nfc 2886  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3350  df-rab 3404  df-v 3443  df-sbc 3728  df-csb 3844  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-pss 3917  df-nul 4271  df-if 4475  df-pw 4550  df-sn 4575  df-pr 4577  df-op 4581  df-uni 4854  df-iun 4944  df-br 5094  df-opab 5156  df-mpt 5177  df-tr 5211  df-id 5519  df-eprel 5525  df-po 5533  df-so 5534  df-fr 5576  df-we 5578  df-xp 5627  df-rel 5628  df-cnv 5629  df-co 5630  df-dm 5631  df-rn 5632  df-res 5633  df-ima 5634  df-ord 6306  df-on 6307  df-suc 6309  df-iota 6432  df-fun 6482  df-fn 6483  df-f 6484  df-f1 6485  df-fo 6486  df-f1o 6487  df-fv 6488  df-ov 7341  df-oprab 7342  df-mpo 7343  df-1st 7900  df-2nd 7901  df-supp 8049  df-1o 8368  df-2o 8369  df-map 8689  df-en 8806  df-fsupp 9228
This theorem is referenced by:  frlmpwfi  41237
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