Theorem umgredgprv 15915

Description: In a multigraph, an edge is an unordered pair of vertices. This theorem would not hold for arbitrary hyper-/pseudographs since either M or N could be proper classes ( ( E ` X ) would be a loop in this case), which are no vertices of course. (Contributed by Alexander van der Vekens, 19-Aug-2017.) (Revised by AV, 11-Dec-2020.)

Hypotheses

Ref	Expression
umgrnloopv.e	|- E = (iEdg ` G )
umgredgprv.v	|- V = (Vtx ` G )

Assertion

Ref	Expression
umgredgprv	|- ( ( G e. UMGraph /\ X e. dom E ) -> ( ( E ` X ) = { M , N } -> ( M e. V /\ N e. V ) ) )

Proof of Theorem umgredgprv

Step	Hyp	Ref	Expression
1		simpr 110	. . . 4 |- ( ( ( G e. UMGraph /\ X e. dom E ) /\ ( E ` X ) = { M , N } ) -> ( E ` X ) = { M , N } )
2		umgruhgr 15913	. . . . . 6 |- ( G e. UMGraph -> G e. UHGraph )
3		umgredgprv.v	. . . . . . 7 |- V = (Vtx ` G )
4		umgrnloopv.e	. . . . . . 7 |- E = (iEdg ` G )
5	3, 4	uhgrss 15875	. . . . . 6 |- ( ( G e. UHGraph /\ X e. dom E ) -> ( E ` X ) C_ V )
6	2, 5	sylan 283	. . . . 5 |- ( ( G e. UMGraph /\ X e. dom E ) -> ( E ` X ) C_ V )
7	6	adantr 276	. . . 4 |- ( ( ( G e. UMGraph /\ X e. dom E ) /\ ( E ` X ) = { M , N } ) -> ( E ` X ) C_ V )
8	1, 7	eqsstrrd 3261	. . 3 |- ( ( ( G e. UMGraph /\ X e. dom E ) /\ ( E ` X ) = { M , N } ) -> { M , N } C_ V )
9	3, 4	umgredg2en 15909	. . . . . . 7 |- ( ( G e. UMGraph /\ X e. dom E ) -> ( E ` X ) ~~ 2o )
10	9	adantr 276	. . . . . 6 |- ( ( ( G e. UMGraph /\ X e. dom E ) /\ ( E ` X ) = { M , N } ) -> ( E ` X ) ~~ 2o )
11	1, 10	eqbrtrrd 4107	. . . . 5 |- ( ( ( G e. UMGraph /\ X e. dom E ) /\ ( E ` X ) = { M , N } ) -> { M , N } ~~ 2o )
12		pr2cv 7370	. . . . 5 |- ( { M , N } ~~ 2o -> ( M e. _V /\ N e. _V ) )
13	11, 12	syl 14	. . . 4 |- ( ( ( G e. UMGraph /\ X e. dom E ) /\ ( E ` X ) = { M , N } ) -> ( M e. _V /\ N e. _V ) )
14		prid1g 3770	. . . . 5 |- ( M e. _V -> M e. { M , N } )
15		prid2g 3771	. . . . 5 |- ( N e. _V -> N e. { M , N } )
16	14, 15	anim12i 338	. . . 4 |- ( ( M e. _V /\ N e. _V ) -> ( M e. { M , N } /\ N e. { M , N } ) )
17		prssg 3825	. . . 4 |- ( ( M e. { M , N } /\ N e. { M , N } ) -> ( ( M e. V /\ N e. V ) <-> { M , N } C_ V ) )
18	13, 16, 17	3syl 17	. . 3 |- ( ( ( G e. UMGraph /\ X e. dom E ) /\ ( E ` X ) = { M , N } ) -> ( ( M e. V /\ N e. V ) <-> { M , N } C_ V ) )
19	8, 18	mpbird 167	. 2 |- ( ( ( G e. UMGraph /\ X e. dom E ) /\ ( E ` X ) = { M , N } ) -> ( M e. V /\ N e. V ) )
20	19	ex 115	1 |- ( ( G e. UMGraph /\ X e. dom E ) -> ( ( E ` X ) = { M , N } -> ( M e. V /\ N e. V ) ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1395   e. wcel 2200   _Vcvv 2799   C_ wss 3197   {cpr 3667   class class class wbr 4083   dom cdm 4719   ` cfv 5318   2oc2o 6556   ~~ cen 6885  Vtxcvtx 15813  iEdgciedg 15814  UHGraphcuhgr 15867  UMGraphcumgr 15892

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-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-nul 4210  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-cnex 8090  ax-resscn 8091  ax-1cn 8092  ax-1re 8093  ax-icn 8094  ax-addcl 8095  ax-addrcl 8096  ax-mulcl 8097  ax-addcom 8099  ax-mulcom 8100  ax-addass 8101  ax-mulass 8102  ax-distr 8103  ax-i2m1 8104  ax-1rid 8106  ax-0id 8107  ax-rnegex 8108  ax-cnre 8110

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-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-if 3603  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-br 4084  df-opab 4146  df-mpt 4147  df-tr 4183  df-id 4384  df-iord 4457  df-on 4459  df-suc 4462  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-f1 5323  df-fo 5324  df-f1o 5325  df-fv 5326  df-riota 5954  df-ov 6004  df-oprab 6005  df-mpo 6006  df-1st 6286  df-2nd 6287  df-1o 6562  df-2o 6563  df-er 6680  df-en 6888  df-sub 8319  df-inn 9111  df-2 9169  df-3 9170  df-4 9171  df-5 9172  df-6 9173  df-7 9174  df-8 9175  df-9 9176  df-n0 9370  df-dec 9579  df-ndx 13035  df-slot 13036  df-base 13038  df-edgf 15806  df-vtx 15815  df-iedg 15816  df-uhgrm 15869  df-upgren 15893  df-umgren 15894

This theorem is referenced by:  umgrnloop  15916  usgredgprv  15994