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Theorem umgrnloop 16128
Description: In a multigraph, there is no loop, i.e. no edge connecting a vertex with itself. (Contributed by Alexander van der Vekens, 19-Aug-2017.) (Revised by AV, 11-Dec-2020.)
Hypothesis
Ref Expression
umgrnloopv.e  |-  E  =  (iEdg `  G )
Assertion
Ref Expression
umgrnloop  |-  ( G  e. UMGraph  ->  ( E. x  e.  dom  E ( E `
 x )  =  { M ,  N }  ->  M  =/=  N
) )
Distinct variable groups:    x, G    x, M    x, N
Allowed substitution hint:    E( x)

Proof of Theorem umgrnloop
StepHypRef Expression
1 umgrnloopv.e . . . . 5  |-  E  =  (iEdg `  G )
2 eqid 2234 . . . . 5  |-  (Vtx `  G )  =  (Vtx
`  G )
31, 2umgredgprv 16127 . . . 4  |-  ( ( G  e. UMGraph  /\  x  e.  dom  E )  -> 
( ( E `  x )  =  { M ,  N }  ->  ( M  e.  (Vtx
`  G )  /\  N  e.  (Vtx `  G
) ) ) )
43imp 124 . . 3  |-  ( ( ( G  e. UMGraph  /\  x  e.  dom  E )  /\  ( E `  x )  =  { M ,  N } )  ->  ( M  e.  (Vtx `  G
)  /\  N  e.  (Vtx `  G ) ) )
51umgrnloopv 16126 . . . . . . . . 9  |-  ( ( G  e. UMGraph  /\  M  e.  (Vtx `  G )
)  ->  ( ( E `  x )  =  { M ,  N }  ->  M  =/=  N
) )
65ex 115 . . . . . . . 8  |-  ( G  e. UMGraph  ->  ( M  e.  (Vtx `  G )  ->  ( ( E `  x )  =  { M ,  N }  ->  M  =/=  N ) ) )
76com23 78 . . . . . . 7  |-  ( G  e. UMGraph  ->  ( ( E `
 x )  =  { M ,  N }  ->  ( M  e.  (Vtx `  G )  ->  M  =/=  N ) ) )
87adantr 276 . . . . . 6  |-  ( ( G  e. UMGraph  /\  x  e.  dom  E )  -> 
( ( E `  x )  =  { M ,  N }  ->  ( M  e.  (Vtx
`  G )  ->  M  =/=  N ) ) )
98imp 124 . . . . 5  |-  ( ( ( G  e. UMGraph  /\  x  e.  dom  E )  /\  ( E `  x )  =  { M ,  N } )  ->  ( M  e.  (Vtx `  G
)  ->  M  =/=  N ) )
109com12 30 . . . 4  |-  ( M  e.  (Vtx `  G
)  ->  ( (
( G  e. UMGraph  /\  x  e.  dom  E )  /\  ( E `  x )  =  { M ,  N } )  ->  M  =/=  N ) )
1110adantr 276 . . 3  |-  ( ( M  e.  (Vtx `  G )  /\  N  e.  (Vtx `  G )
)  ->  ( (
( G  e. UMGraph  /\  x  e.  dom  E )  /\  ( E `  x )  =  { M ,  N } )  ->  M  =/=  N ) )
124, 11mpcom 36 . 2  |-  ( ( ( G  e. UMGraph  /\  x  e.  dom  E )  /\  ( E `  x )  =  { M ,  N } )  ->  M  =/=  N )
1312rexlimdva2 2665 1  |-  ( G  e. UMGraph  ->  ( E. x  e.  dom  E ( E `
 x )  =  { M ,  N }  ->  M  =/=  N
) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1398    e. wcel 2205    =/= wne 2414   E.wrex 2523   {cpr 3692   dom cdm 4751   ` cfv 5354  Vtxcvtx 16024  iEdgciedg 16025  UMGraphcumgr 16104
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4230  ax-nul 4238  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-iinf 4712  ax-cnex 8220  ax-resscn 8221  ax-1cn 8222  ax-1re 8223  ax-icn 8224  ax-addcl 8225  ax-addrcl 8226  ax-mulcl 8227  ax-addcom 8229  ax-mulcom 8230  ax-addass 8231  ax-mulass 8232  ax-distr 8233  ax-i2m1 8234  ax-1rid 8236  ax-0id 8237  ax-rnegex 8238  ax-cnre 8240
This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-if 3623  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-br 4112  df-opab 4174  df-mpt 4175  df-tr 4211  df-id 4416  df-iord 4489  df-on 4491  df-suc 4494  df-iom 4715  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-riota 6005  df-ov 6055  df-oprab 6056  df-mpo 6057  df-1st 6336  df-2nd 6337  df-1o 6649  df-2o 6650  df-er 6769  df-en 6978  df-sub 8448  df-inn 9240  df-2 9298  df-3 9299  df-4 9300  df-5 9301  df-6 9302  df-7 9303  df-8 9304  df-9 9305  df-n0 9499  df-dec 9713  df-ndx 13232  df-slot 13233  df-base 13235  df-edgf 16017  df-vtx 16026  df-iedg 16027  df-uhgrm 16081  df-upgren 16105  df-umgren 16106
This theorem is referenced by:  umgrnloop0  16129  usgrnloop  16214
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