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Theorem joinlem 16817
Description: Lemma for join properties.
Hypotheses
Ref Expression
joinval2.b |- B = (base` K)
joinval2.l |- L = (le` K)
joinval2.j |- J = (join` K)
Assertion
Ref Expression
joinlem |- (((K e. A /\ X e. B /\ Y e. B) /\ (XJY) e. B) -> ((XL(XJY) /\ YL(XJY)) /\ A.z e. B ((XLz /\ YLz) -> (XJY)Lz)))
Distinct variable groups:   z,B   z,J   z,K   z,L   z,X   z,Y

Proof of Theorem joinlem
StepHypRef Expression
1 joinval2.b . . . . . . 7 |- B = (base` K)
2 joinval2.l . . . . . . 7 |- L = (le` K)
3 joinval2.j . . . . . . 7 |- J = (join` K)
41, 2, 3joinval2 16816 . . . . . 6 |- ((K e. A /\ X e. B /\ Y e. B) -> (XJY) = (iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))))
54eleq1d 1963 . . . . 5 |- ((K e. A /\ X e. B /\ Y e. B) -> ((XJY) e. B <-> (iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) e. B))
6 fvex 4689 . . . . . . . 8 |- (base` K) e. _V
71, 6eqeltri 1967 . . . . . . 7 |- B e. _V
87riotaclb 5573 . . . . . 6 |- (E!x e. B ((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz)) <-> (iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) e. B)
9 riota4 5577 . . . . . 6 |- (E!x e. B ((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz)) -> [(iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz)))
108, 9sylbir 218 . . . . 5 |- ((iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) e. B -> [(iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz)))
115, 10syl6bi 231 . . . 4 |- ((K e. A /\ X e. B /\ Y e. B) -> ((XJY) e. B -> [(iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))))
12 dfsbcq 2455 . . . . 5 |- ((XJY) = (iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) -> ([(XJY) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz)) <-> [(iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))))
134, 12syl 12 . . . 4 |- ((K e. A /\ X e. B /\ Y e. B) -> ([(XJY) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz)) <-> [(iota_x e. B((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))))
1411, 13sylibrd 221 . . 3 |- ((K e. A /\ X e. B /\ Y e. B) -> ((XJY) e. B -> [(XJY) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz))))
15 oprex 4907 . . . 4 |- (XJY) e. _V
16 breq2 3342 . . . . . 6 |- (x = (XJY) -> (XLx <-> XL(XJY)))
17 breq2 3342 . . . . . 6 |- (x = (XJY) -> (YLx <-> YL(XJY)))
1816, 17anbi12d 690 . . . . 5 |- (x = (XJY) -> ((XLx /\ YLx) <-> (XL(XJY) /\ YL(XJY))))
19 breq1 3341 . . . . . . 7 |- (x = (XJY) -> (xLz <-> (XJY)Lz))
2019imbi2d 674 . . . . . 6 |- (x = (XJY) -> (((XLz /\ YLz) -> xLz) <-> ((XLz /\ YLz) -> (XJY)Lz)))
2120ralbidv 2123 . . . . 5 |- (x = (XJY) -> (A.z e. B ((XLz /\ YLz) -> xLz) <-> A.z e. B ((XLz /\ YLz) -> (XJY)Lz)))
2218, 21anbi12d 690 . . . 4 |- (x = (XJY) -> (((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz)) <-> ((XL(XJY) /\ YL(XJY)) /\ A.z e. B ((XLz /\ YLz) -> (XJY)Lz))))
2315, 22sbcie 2485 . . 3 |- ([(XJY) / x]((XLx /\ YLx) /\ A.z e. B ((XLz /\ YLz) -> xLz)) <-> ((XL(XJY) /\ YL(XJY)) /\ A.z e. B ((XLz /\ YLz) -> (XJY)Lz)))
2414, 23syl6ib 229 . 2 |- ((K e. A /\ X e. B /\ Y e. B) -> ((XJY) e. B -> ((XL(XJY) /\ YL(XJY)) /\ A.z e. B ((XLz /\ YLz) -> (XJY)Lz))))
2524imp 377 1 |- (((K e. A /\ X e. B /\ Y e. B) /\ (XJY) e. B) -> ((XL(XJY) /\ YL(XJY)) /\ A.z e. B ((XLz /\ YLz) -> (XJY)Lz)))
Colors of variables: wff set class
Syntax hints:   -> wi 3   <-> wb 163   /\ wa 240   /\ w3a 858   = wceq 1298   e. wcel 1300  [wsbc 1534  A.wral 2105  E!wreu 2107  _Vcvv 2292   class class class wbr 3338  ` cfv 3998  (class class class)co 4884  iota_crio 5555  basecbs 16758  lecple 16759  joincjn 16766
This theorem is referenced by:  lejoin1 16818  lejoin2 16819  joinle 16820
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-13 1311  ax-14 1312  ax-17 1317  ax-4 1319  ax-5o 1321  ax-6o 1324  ax-9o 1481  ax-10o 1500  ax-16 1580  ax-11o 1588  ax-ext 1865  ax-rep 3428  ax-sep 3438  ax-nul 3445  ax-pow 3481  ax-pr 3524  ax-un 3790
This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-3an 860  df-ex 1327  df-sb 1536  df-eu 1775  df-mo 1776  df-clab 1872  df-cleq 1877  df-clel 1880  df-ne 2019  df-ral 2109  df-rex 2110  df-reu 2111  df-rab 2112  df-v 2294  df-sbc 2454  df-csb 2541  df-dif 2597  df-un 2600  df-in 2603  df-ss 2605  df-nul 2876  df-if 2983  df-pw 3035  df-sn 3049  df-pr 3050  df-op 3053  df-uni 3178  df-br 3339  df-opab 3396  df-id 3586  df-xp 4000  df-rel 4001  df-cnv 4002  df-co 4003  df-dm 4004  df-rn 4005  df-res 4006  df-ima 4007  df-fun 4008  df-fn 4009  df-f 4010  df-f1 4011  df-fo 4012  df-f1o 4013  df-fv 4014  df-opr 4886  df-oprab 4887  df-mpt 5006  df-mpt2 5007  df-iota 5089  df-er 5318  df-en 5427  df-dom 5428  df-sdom 5429  df-undef 5556  df-riota 5560  df-lub 16799  df-join 16801
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