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Theorem fndmeng 8075
Description: A function is equinumerate to its domain. (Contributed by Paul Chapman, 22-Jun-2011.)
Assertion
Ref Expression
fndmeng ((𝐹 Fn 𝐴𝐴𝐶) → 𝐴𝐹)

Proof of Theorem fndmeng
StepHypRef Expression
1 fnex 6522 . . 3 ((𝐹 Fn 𝐴𝐴𝐶) → 𝐹 ∈ V)
2 fnfun 6026 . . . 4 (𝐹 Fn 𝐴 → Fun 𝐹)
32adantr 480 . . 3 ((𝐹 Fn 𝐴𝐴𝐶) → Fun 𝐹)
4 fundmeng 8072 . . 3 ((𝐹 ∈ V ∧ Fun 𝐹) → dom 𝐹𝐹)
51, 3, 4syl2anc 694 . 2 ((𝐹 Fn 𝐴𝐴𝐶) → dom 𝐹𝐹)
6 fndm 6028 . . . 4 (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴)
76breq1d 4695 . . 3 (𝐹 Fn 𝐴 → (dom 𝐹𝐹𝐴𝐹))
87adantr 480 . 2 ((𝐹 Fn 𝐴𝐴𝐶) → (dom 𝐹𝐹𝐴𝐹))
95, 8mpbid 222 1 ((𝐹 Fn 𝐴𝐴𝐶) → 𝐴𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  wcel 2030  Vcvv 3231   class class class wbr 4685  dom cdm 5143  Fun wfun 5920   Fn wfn 5921  cen 7994
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-en 7998
This theorem is referenced by:  tskcard  9641  hashfn  13202
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