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Theorem oprssdm 3056
Description: Domain of closure of an operation.
Hypotheses
Ref Expression
oprssdm.1 ¬ ∅ ∈ S
oprssdm.2 ((xSyS) → (xFy) ∈ S)
Assertion
Ref Expression
oprssdm (S × S) ⊆ dom F
Distinct variable group(s):   x,y,S   x,F,y

Proof of Theorem oprssdm
StepHypRef Expression
1 relxp 2486 . 2 Rel (S × S)
2 visset 1350 . . . 4 yV
32opelxp 2452 . . 3 (⟨x, y⟩ ∈ (S × S) ↔ (xSyS))
4 ndmfv 2848 . . . . 5 (¬ ⟨x, y⟩ ∈ dom F → (F ‘⟨x, y⟩) = ∅)
5 df-opr 3003 . . . . . . 7 (xFy) = (F ‘⟨x, y⟩)
65cleq1i 1108 . . . . . 6 ((xFy) = ∅ ↔ (F ‘⟨x, y⟩) = ∅)
7 oprssdm.1 . . . . . . . 8 ¬ ∅ ∈ S
8 eleq1 1149 . . . . . . . 8 ((xFy) = ∅ → ((xFy) ∈ S ↔ ∅ ∈ S))
97, 8mtbiri 539 . . . . . . 7 ((xFy) = ∅ → ¬ (xFy) ∈ S)
10 oprssdm.2 . . . . . . 7 ((xSyS) → (xFy) ∈ S)
119, 10nsyl 102 . . . . . 6 ((xFy) = ∅ → ¬ (xSyS))
126, 11sylbir 176 . . . . 5 ((F ‘⟨x, y⟩) = ∅ → ¬ (xSyS))
134, 12syl 12 . . . 4 (¬ ⟨x, y⟩ ∈ dom F → ¬ (xSyS))
1413a3i 69 . . 3 ((xSyS) → ⟨x, y⟩ ∈ dom F)
153, 14sylbi 174 . 2 (⟨x, y⟩ ∈ (S × S) → ⟨x, y⟩ ∈ dom F)
161, 15relssi 2481 1 (S × S) ⊆ dom F
Colors of variables: wff set class
Syntax hints:  ¬ wn 1   → wi 2   ∧ wa 196   = wceq 1091   ∈ wcel 1092   ⊆ wss 1487  ∅c0 1707  ⟨cop 1810   × cxp 2408  dom cdm 2410   ‘cfv 2422  (class class class)co 3001
This theorem is referenced by:  dmaddpq 3853  dmmulpq 3855  dmaddsr 3988  dmmulsr 3989
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-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-eu 1009  df-clab 1093  df-cleq 1097  df-clel 1099  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-xp 2424  df-rel 2425  df-cnv 2426  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fv 2438  df-opr 3003
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