Theorem upgredg2vtx 15822

Description: For a vertex incident to an edge there is another vertex incident to the edge in a pseudograph. (Contributed by AV, 18-Oct-2020.) (Revised by AV, 5-Dec-2020.)

Hypotheses

Ref	Expression
upgredg.v	|- V = (Vtx ` G )
upgredg.e	|- E = (Edg ` G )

Assertion

Ref	Expression
upgredg2vtx	|- ( ( G e. UPGraph /\ C e. E /\ A e. C ) -> E. b e. V C = { A , b } )

Distinct variable groups:   C, b   G, b   V, b   A, b

Allowed substitution hint:   E( b)

Proof of Theorem upgredg2vtx

Dummy variables a c are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		upgredg.v	. . . 4 |- V = (Vtx ` G )
2		upgredg.e	. . . 4 |- E = (Edg ` G )
3	1, 2	upgredg 15818	. . 3 |- ( ( G e. UPGraph /\ C e. E ) -> E. a e. V E. c e. V C = { a , c } )
4	3	3adant3 1020	. 2 |- ( ( G e. UPGraph /\ C e. E /\ A e. C ) -> E. a e. V E. c e. V C = { a , c } )
5		elpr2elpr 3825	. . . . . . 7 |- ( ( a e. V /\ c e. V /\ A e. { a , c } ) -> E. b e. V { a , c } = { A , b } )
6	5	3expia 1208	. . . . . 6 |- ( ( a e. V /\ c e. V ) -> ( A e. { a , c } -> E. b e. V { a , c } = { A , b } ) )
7		eleq2 2270	. . . . . . 7 |- ( C = { a , c } -> ( A e. C <-> A e. { a , c } ) )
8		eqeq1 2213	. . . . . . . 8 |- ( C = { a , c } -> ( C = { A , b } <-> { a , c } = { A , b } ) )
9	8	rexbidv 2508	. . . . . . 7 |- ( C = { a , c } -> ( E. b e. V C = { A , b } <-> E. b e. V { a , c } = { A , b } ) )
10	7, 9	imbi12d 234	. . . . . 6 |- ( C = { a , c } -> ( ( A e. C -> E. b e. V C = { A , b } ) <-> ( A e. { a , c } -> E. b e. V { a , c } = { A , b } ) ) )
11	6, 10	imbitrrid 156	. . . . 5 |- ( C = { a , c } -> ( ( a e. V /\ c e. V ) -> ( A e. C -> E. b e. V C = { A , b } ) ) )
12	11	com13 80	. . . 4 |- ( A e. C -> ( ( a e. V /\ c e. V ) -> ( C = { a , c } -> E. b e. V C = { A , b } ) ) )
13	12	3ad2ant3 1023	. . 3 |- ( ( G e. UPGraph /\ C e. E /\ A e. C ) -> ( ( a e. V /\ c e. V ) -> ( C = { a , c } -> E. b e. V C = { A , b } ) ) )
14	13	rexlimdvv 2631	. 2 |- ( ( G e. UPGraph /\ C e. E /\ A e. C ) -> ( E. a e. V E. c e. V C = { a , c } -> E. b e. V C = { A , b } ) )
15	4, 14	mpd 13	1 |- ( ( G e. UPGraph /\ C e. E /\ A e. C ) -> E. b e. V C = { A , b } )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 981   = wceq 1373   e. wcel 2177   E.wrex 2486   {cpr 3639   ` cfv 5285  Vtxcvtx 15696  Edgcedg 15739  UPGraphcupgr 15772

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 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2179  ax-14 2180  ax-ext 2188  ax-sep 4173  ax-nul 4181  ax-pow 4229  ax-pr 4264  ax-un 4493  ax-setind 4598  ax-cnex 8046  ax-resscn 8047  ax-1cn 8048  ax-1re 8049  ax-icn 8050  ax-addcl 8051  ax-addrcl 8052  ax-mulcl 8053  ax-addcom 8055  ax-mulcom 8056  ax-addass 8057  ax-mulass 8058  ax-distr 8059  ax-i2m1 8060  ax-1rid 8062  ax-0id 8063  ax-rnegex 8064  ax-cnre 8066

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ne 2378  df-ral 2490  df-rex 2491  df-reu 2492  df-rab 2494  df-v 2775  df-sbc 3003  df-csb 3098  df-dif 3172  df-un 3174  df-in 3176  df-ss 3183  df-nul 3465  df-if 3576  df-pw 3623  df-sn 3644  df-pr 3645  df-op 3647  df-uni 3860  df-int 3895  df-br 4055  df-opab 4117  df-mpt 4118  df-tr 4154  df-id 4353  df-iord 4426  df-on 4428  df-suc 4431  df-xp 4694  df-rel 4695  df-cnv 4696  df-co 4697  df-dm 4698  df-rn 4699  df-res 4700  df-ima 4701  df-iota 5246  df-fun 5287  df-fn 5288  df-f 5289  df-f1 5290  df-fo 5291  df-f1o 5292  df-fv 5293  df-riota 5917  df-ov 5965  df-oprab 5966  df-mpo 5967  df-1st 6244  df-2nd 6245  df-1o 6520  df-2o 6521  df-en 6846  df-sub 8275  df-inn 9067  df-2 9125  df-3 9126  df-4 9127  df-5 9128  df-6 9129  df-7 9130  df-8 9131  df-9 9132  df-n0 9326  df-dec 9535  df-ndx 12920  df-slot 12921  df-base 12923  df-edgf 15689  df-vtx 15698  df-iedg 15699  df-edg 15740  df-upgren 15774

This theorem is referenced by: (None)