Theorem fntp 5949

Description: A function with a domain of three elements. (Contributed by NM, 14-Sep-2011.) (Revised by Mario Carneiro, 26-Apr-2015.)

Hypotheses

Ref	Expression
fntp.1	|- A e. _V
fntp.2	|- B e. _V
fntp.3	|- C e. _V
fntp.4	|- D e. _V
fntp.5	|- E e. _V
fntp.6	|- F e. _V

Assertion

Ref	Expression
fntp	|- ( ( A =/= B /\ A =/= C /\ B =/= C ) -> { <. A , D >. , <. B , E >. , <. C , F >. } Fn { A , B , C } )

Proof of Theorem fntp

Step	Hyp	Ref	Expression
1		fntp.1	. . 3 |- A e. _V
2		fntp.2	. . 3 |- B e. _V
3		fntp.3	. . 3 |- C e. _V
4		fntp.4	. . 3 |- D e. _V
5		fntp.5	. . 3 |- E e. _V
6		fntp.6	. . 3 |- F e. _V
7	1, 2, 3, 4, 5, 6	funtp 5945	. 2 |- ( ( A =/= B /\ A =/= C /\ B =/= C ) -> Fun { <. A , D >. , <. B , E >. , <. C , F >. } )
8	4, 5, 6	dmtpop 5611	. . 3 |- dom { <. A , D >. , <. B , E >. , <. C , F >. } = { A , B , C }
9	8	a1i 11	. 2 |- ( ( A =/= B /\ A =/= C /\ B =/= C ) -> dom { <. A , D >. , <. B , E >. , <. C , F >. } = { A , B , C } )
10		df-fn 5891	. 2 |- ( { <. A , D >. , <. B , E >. , <. C , F >. } Fn { A , B , C } <-> ( Fun { <. A , D >. , <. B , E >. , <. C , F >. } /\ dom { <. A , D >. , <. B , E >. , <. C , F >. } = { A , B , C } ) )
11	7, 9, 10	sylanbrc 698	1 |- ( ( A =/= B /\ A =/= C /\ B =/= C ) -> { <. A , D >. , <. B , E >. , <. C , F >. } Fn { A , B , C } )

Syntax hints:   -> wi 4   /\ w3a 1037   = wceq 1483   e. wcel 1990   =/= wne 2794   _Vcvv 3200   {ctp 4181   <.cop 4183   dom cdm 5114   Fun wfun 5882   Fn wfn 5883

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-br 4654  df-opab 4713  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-fun 5890  df-fn 5891

This theorem is referenced by:  fntpb  6473  rabren3dioph  37379