Theorem 1strbas 12576

Description: The base set of a constructed one-slot structure. (Contributed by AV, 27-Mar-2020.)

Hypothesis

Ref	Expression
1str.g	|- G = { <. ( Base ` ndx ) , B >. }

Assertion

Ref	Expression
1strbas	|- ( B e. V -> B = ( Base ` G ) )

Proof of Theorem 1strbas

Step	Hyp	Ref	Expression
1		baseslid 12519	. 2 |- ( Base = Slot ( Base ` ndx ) /\ ( Base ` ndx ) e. NN )
2		1str.g	. . 3 |- G = { <. ( Base ` ndx ) , B >. }
3		basendxnn 12518	. . . . 5 |- ( Base ` ndx ) e. NN
4		opexg 4229	. . . . 5 |- ( ( ( Base ` ndx ) e. NN /\ B e. V ) -> <. ( Base ` ndx ) , B >. e. _V )
5	3, 4	mpan 424	. . . 4 |- ( B e. V -> <. ( Base ` ndx ) , B >. e. _V )
6		snexg 4185	. . . 4 |- ( <. ( Base ` ndx ) , B >. e. _V -> { <. ( Base ` ndx ) , B >. } e. _V )
7	5, 6	syl 14	. . 3 |- ( B e. V -> { <. ( Base ` ndx ) , B >. } e. _V )
8	2, 7	eqeltrid 2264	. 2 |- ( B e. V -> G e. _V )
9		funsng 5263	. . . 4 |- ( ( ( Base ` ndx ) e. NN /\ B e. V ) -> Fun { <. ( Base ` ndx ) , B >. } )
10	3, 9	mpan 424	. . 3 |- ( B e. V -> Fun { <. ( Base ` ndx ) , B >. } )
11	2	funeqi 5238	. . 3 |- ( Fun G <-> Fun { <. ( Base ` ndx ) , B >. } )
12	10, 11	sylibr 134	. 2 |- ( B e. V -> Fun G )
13		snidg 3622	. . . 4 |- ( <. ( Base ` ndx ) , B >. e. _V -> <. ( Base ` ndx ) , B >. e. { <. ( Base ` ndx ) , B >. } )
14	5, 13	syl 14	. . 3 |- ( B e. V -> <. ( Base ` ndx ) , B >. e. { <. ( Base ` ndx ) , B >. } )
15	14, 2	eleqtrrdi 2271	. 2 |- ( B e. V -> <. ( Base ` ndx ) , B >. e. G )
16	1, 8, 12, 15	strslfvd 12504	1 |- ( B e. V -> B = ( Base ` G ) )

Syntax hints:   -> wi 4   = wceq 1353   e. wcel 2148   _Vcvv 2738   {csn 3593   <.cop 3596   Fun wfun 5211   ` cfv 5217   NNcn 8919   ndxcnx 12459   Basecbs 12462

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-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4122  ax-pow 4175  ax-pr 4210  ax-un 4434  ax-cnex 7902  ax-resscn 7903  ax-1re 7905  ax-addrcl 7908

This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2740  df-sbc 2964  df-un 3134  df-in 3136  df-ss 3143  df-pw 3578  df-sn 3599  df-pr 3600  df-op 3602  df-uni 3811  df-int 3846  df-br 4005  df-opab 4066  df-mpt 4067  df-id 4294  df-xp 4633  df-rel 4634  df-cnv 4635  df-co 4636  df-dm 4637  df-rn 4638  df-res 4639  df-iota 5179  df-fun 5219  df-fv 5225  df-inn 8920  df-ndx 12465  df-slot 12466  df-base 12468

This theorem is referenced by: (None)