Theorem tosglb 29670

Description: Same theorem as toslub 29668, for infinimum. (Contributed by Thierry Arnoux, 17-Feb-2018.) (Revised by AV, 28-Sep-2020.)

Hypotheses

Ref	Expression
tosglb.b	|- B = ( Base ` K )
tosglb.l	|- .< = ( lt ` K )
tosglb.1	|- ( ph -> K e. Toset )
tosglb.2	|- ( ph -> A C_ B )

Assertion

Ref	Expression
tosglb	|- ( ph -> ( ( glb ` K ) ` A ) = inf ( A , B , .< ) )

Proof of Theorem tosglb

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

Step	Hyp	Ref	Expression
1		tosglb.b	. . . . 5 |- B = ( Base ` K )
2		tosglb.l	. . . . 5 |- .< = ( lt ` K )
3		tosglb.1	. . . . 5 |- ( ph -> K e. Toset )
4		tosglb.2	. . . . 5 |- ( ph -> A C_ B )
5		eqid 2622	. . . . 5 |- ( le ` K ) = ( le ` K )
6	1, 2, 3, 4, 5	tosglblem 29669	. . . 4 |- ( ( ph /\ a e. B ) -> ( ( A. b e. A a ( le ` K ) b /\ A. c e. B ( A. b e. A c ( le ` K ) b -> c ( le ` K ) a ) ) <-> ( A. b e. A -. a `' .< b /\ A. b e. B ( b `' .< a -> E. d e. A b `' .< d ) ) ) )
7	6	riotabidva 6627	. . 3 |- ( ph -> ( iota_ a e. B ( A. b e. A a ( le ` K ) b /\ A. c e. B ( A. b e. A c ( le ` K ) b -> c ( le ` K ) a ) ) ) = ( iota_ a e. B ( A. b e. A -. a `' .< b /\ A. b e. B ( b `' .< a -> E. d e. A b `' .< d ) ) ) )
8		eqid 2622	. . . 4 |- ( glb ` K ) = ( glb ` K )
9		biid 251	. . . 4 |- ( ( A. b e. A a ( le ` K ) b /\ A. c e. B ( A. b e. A c ( le ` K ) b -> c ( le ` K ) a ) ) <-> ( A. b e. A a ( le ` K ) b /\ A. c e. B ( A. b e. A c ( le ` K ) b -> c ( le ` K ) a ) ) )
10	1, 5, 8, 9, 3, 4	glbval 16997	. . 3 |- ( ph -> ( ( glb ` K ) ` A ) = ( iota_ a e. B ( A. b e. A a ( le ` K ) b /\ A. c e. B ( A. b e. A c ( le ` K ) b -> c ( le ` K ) a ) ) ) )
11	1, 5, 2	tosso 17036	. . . . . . 7 |- ( K e. Toset -> ( K e. Toset <-> ( .< Or B /\ ( _I |` B ) C_ ( le ` K ) ) ) )
12	11	ibi 256	. . . . . 6 |- ( K e. Toset -> ( .< Or B /\ ( _I |` B ) C_ ( le ` K ) ) )
13	12	simpld 475	. . . . 5 |- ( K e. Toset -> .< Or B )
14		cnvso 5674	. . . . 5 |- ( .< Or B <-> `' .< Or B )
15	13, 14	sylib 208	. . . 4 |- ( K e. Toset -> `' .< Or B )
16		id 22	. . . . 5 |- ( `' .< Or B -> `' .< Or B )
17	16	supval2 8361	. . . 4 |- ( `' .< Or B -> sup ( A , B , `' .< ) = ( iota_ a e. B ( A. b e. A -. a `' .< b /\ A. b e. B ( b `' .< a -> E. d e. A b `' .< d ) ) ) )
18	3, 15, 17	3syl 18	. . 3 |- ( ph -> sup ( A , B , `' .< ) = ( iota_ a e. B ( A. b e. A -. a `' .< b /\ A. b e. B ( b `' .< a -> E. d e. A b `' .< d ) ) ) )
19	7, 10, 18	3eqtr4d 2666	. 2 |- ( ph -> ( ( glb ` K ) ` A ) = sup ( A , B , `' .< ) )
20		df-inf 8349	. . . 4 |- inf ( A , B , .< ) = sup ( A , B , `' .< )
21	20	eqcomi 2631	. . 3 |- sup ( A , B , `' .< ) = inf ( A , B , .< )
22	21	a1i 11	. 2 |- ( ph -> sup ( A , B , `' .< ) = inf ( A , B , .< ) )
23	19, 22	eqtrd 2656	1 |- ( ph -> ( ( glb ` K ) ` A ) = inf ( A , B , .< ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 384   = wceq 1483   e. wcel 1990   A.wral 2912   E.wrex 2913   C_ wss 3574   class class class wbr 4653   _I cid 5023   Or wor 5034   `'ccnv 5113   |` cres 5116   ` cfv 5888   iota_crio 6610   supcsup 8346  infcinf 8347   Basecbs 15857   lecple 15948   ltcplt 16941   glbcglb 16943  Tosetctos 17033

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-po 5035  df-so 5036  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-sup 8348  df-inf 8349  df-preset 16928  df-poset 16946  df-plt 16958  df-glb 16975  df-toset 17034

This theorem is referenced by:  xrsp0  29681