Theorem fntp 5377

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 5373	. 2 |- ( ( A =/= B /\ A =/= C /\ B =/= C ) -> Fun { <. A , D >. , <. B , E >. , <. C , F >. } )
8	4, 5, 6	dmtpop 5203	. . 3 |- dom { <. A , D >. , <. B , E >. , <. C , F >. } = { A , B , C }
9	8	a1i 9	. 2 |- ( ( A =/= B /\ A =/= C /\ B =/= C ) -> dom { <. A , D >. , <. B , E >. , <. C , F >. } = { A , B , C } )
10		df-fn 5320	. 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 417	1 |- ( ( A =/= B /\ A =/= C /\ B =/= C ) -> { <. A , D >. , <. B , E >. , <. C , F >. } Fn { A , B , C } )

Syntax hints:   -> wi 4   /\ w3a 1002   = wceq 1395   e. wcel 2200   =/= wne 2400   _Vcvv 2799   {ctp 3668   <.cop 3669   dom cdm 4718   Fun wfun 5311   Fn wfn 5312

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4201  ax-pow 4257  ax-pr 4292

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-v 2801  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-tp 3674  df-op 3675  df-br 4083  df-opab 4145  df-id 4383  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-fun 5319  df-fn 5320

This theorem is referenced by: (None)