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Theorem fndmeng 8980
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 7168 . . 3 ((𝐹 Fn 𝐴𝐴𝐶) → 𝐹 ∈ V)
2 fnfun 6603 . . . 4 (𝐹 Fn 𝐴 → Fun 𝐹)
32adantr 482 . . 3 ((𝐹 Fn 𝐴𝐴𝐶) → Fun 𝐹)
4 fundmeng 8977 . . 3 ((𝐹 ∈ V ∧ Fun 𝐹) → dom 𝐹𝐹)
51, 3, 4syl2anc 585 . 2 ((𝐹 Fn 𝐴𝐴𝐶) → dom 𝐹𝐹)
6 fndm 6606 . . . 4 (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴)
76breq1d 5116 . . 3 (𝐹 Fn 𝐴 → (dom 𝐹𝐹𝐴𝐹))
87adantr 482 . 2 ((𝐹 Fn 𝐴𝐴𝐶) → (dom 𝐹𝐹𝐴𝐹))
95, 8mpbid 231 1 ((𝐹 Fn 𝐴𝐴𝐶) → 𝐴𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 397  wcel 2107  Vcvv 3446   class class class wbr 5106  dom cdm 5634  Fun wfun 6491   Fn wfn 6492  cen 8881
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-rep 5243  ax-sep 5257  ax-nul 5264  ax-pow 5321  ax-pr 5385  ax-un 7673
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  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-reu 3355  df-rab 3409  df-v 3448  df-sbc 3741  df-csb 3857  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4284  df-if 4488  df-pw 4563  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4867  df-int 4909  df-iun 4957  df-br 5107  df-opab 5169  df-mpt 5190  df-id 5532  df-xp 5640  df-rel 5641  df-cnv 5642  df-co 5643  df-dm 5644  df-rn 5645  df-res 5646  df-ima 5647  df-iota 6449  df-fun 6499  df-fn 6500  df-f 6501  df-f1 6502  df-fo 6503  df-f1o 6504  df-fv 6505  df-en 8885
This theorem is referenced by:  tskcard  10718  hashfn  14276
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