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Theorem mapdom2lem 3388
Description: Lemma for mapdom2 3389.
Hypotheses
Ref Expression
mapdom1.1 AV
mapdom1.2 BV
mapdom1.3 CV
Assertion
Ref Expression
mapdom2lem (x ∈ (Cm z) → (x ∩ ((Bz) × {w})) = ∅)
Distinct variable group(s):   x,z,w,A   x,B,z,w   x,C,z,w

Proof of Theorem mapdom2lem
StepHypRef Expression
1 mapdom1.3 . . . . . . . 8 CV
2 visset 1350 . . . . . . . 8 zV
31, 2elmap 3265 . . . . . . 7 (x ∈ (Cm z) ↔ x:z–→C)
43biimp 133 . . . . . 6 (x ∈ (Cm z) → x:z–→C)
5 fdm 2756 . . . . . 6 (x:z–→C → dom x = z)
64, 5syl 12 . . . . 5 (x ∈ (Cm z) → dom x = z)
7 visset 1350 . . . . . . . 8 wV
87fconst 2774 . . . . . . 7 ((Bz) × {w}):(Bz)–→{w}
9 fdm 2756 . . . . . . 7 (((Bz) × {w}):(Bz)–→{w} → dom ((Bz) × {w}) = (Bz))
108, 9ax-mp 6 . . . . . 6 dom ((Bz) × {w}) = (Bz)
1110a1i 7 . . . . 5 (x ∈ (Cm z) → dom ((Bz) × {w}) = (Bz))
126, 11ineq12d 1646 . . . 4 (x ∈ (Cm z) → (dom x ∩ dom ((Bz) × {w})) = (z ∩ (Bz)))
13 difdisj 1758 . . . 4 (z ∩ (Bz)) = ∅
1412, 13syl6eq 1140 . . 3 (x ∈ (Cm z) → (dom x ∩ dom ((Bz) × {w})) = ∅)
15 dmin 2537 . . . . 5 dom (x ∩ ((Bz) × {w})) ⊆ (dom x ∩ dom ((Bz) × {w}))
16 sseq2 1522 . . . . 5 ((dom x ∩ dom ((Bz) × {w})) = ∅ → (dom (x ∩ ((Bz) × {w})) ⊆ (dom x ∩ dom ((Bz) × {w})) ↔ dom (x ∩ ((Bz) × {w})) ⊆ ∅))
1715, 16mpbii 168 . . . 4 ((dom x ∩ dom ((Bz) × {w})) = ∅ → dom (x ∩ ((Bz) × {w})) ⊆ ∅)
18 ss0 1727 . . . 4 (dom (x ∩ ((Bz) × {w})) ⊆ ∅ → dom (x ∩ ((Bz) × {w})) = ∅)
1917, 18syl 12 . . 3 ((dom x ∩ dom ((Bz) × {w})) = ∅ → dom (x ∩ ((Bz) × {w})) = ∅)
2014, 19syl 12 . 2 (x ∈ (Cm z) → dom (x ∩ ((Bz) × {w})) = ∅)
21 relxp 2486 . . . . 5 Rel ((Bz) × {w})
22 relin 2491 . . . . 5 (Rel ((Bz) × {w}) → Rel (((Bz) × {w}) ∩ x))
2321, 22ax-mp 6 . . . 4 Rel (((Bz) × {w}) ∩ x)
24 incom 1636 . . . . 5 (((Bz) × {w}) ∩ x) = (x ∩ ((Bz) × {w}))
25 releq 2477 . . . . 5 ((((Bz) × {w}) ∩ x) = (x ∩ ((Bz) × {w})) → (Rel (((Bz) × {w}) ∩ x) ↔ Rel (x ∩ ((Bz) × {w}))))
2624, 25ax-mp 6 . . . 4 (Rel (((Bz) × {w}) ∩ x) ↔ Rel (x ∩ ((Bz) × {w})))
2723, 26mpbi 164 . . 3 Rel (x ∩ ((Bz) × {w}))
28 reldm0 2550 . . 3 (Rel (x ∩ ((Bz) × {w})) → ((x ∩ ((Bz) × {w})) = ∅ ↔ dom (x ∩ ((Bz) × {w})) = ∅))
2927, 28ax-mp 6 . 2 ((x ∩ ((Bz) × {w})) = ∅ ↔ dom (x ∩ ((Bz) × {w})) = ∅)
3020, 29sylibr 175 1 (x ∈ (Cm z) → (x ∩ ((Bz) × {w})) = ∅)
Colors of variables: wff set class
Syntax hints:   → wi 2   ↔ wb 127   = wceq 1091   ∈ wcel 1092  Vcvv 1348   ∖ cdif 1484   ∩ cin 1486   ⊆ wss 1487  ∅c0 1707  {csn 1808   × cxp 2408  dom cdm 2410  Rel wrel 2415  –→wf 2418  (class class class)co 3001   ↑m cm 3258
This theorem is referenced by:  mapdom2 3389
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-un 1076  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3an 583  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010  df-clab 1093  df-cleq 1097  df-clel 1099  df-ral 1205  df-rex 1206  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-uni 1920  df-br 2063  df-opab 2098  df-id 2125  df-xp 2424  df-rel 2425  df-cnv 2426  df-co 2427  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fun 2432  df-fn 2433  df-f 2434  df-fv 2438  df-opr 3003  df-oprab 3004  df-map 3259
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