HomeHome Metamath Proof Explorer < Previous   Next >
Related theorems
GIF version

Theorem supex 2157
Description: A supremum is a set.
Hypothesis
Ref Expression
supmo.1 R Or A
Assertion
Ref Expression
supex sup(B, A, R) ∈ V

Proof of Theorem supex
StepHypRef Expression
1 df-sup 2154 . . 3 sup(B, A, R) = {xA∣(∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz))}
2 df-rab 1208 . . . 4 {xA∣(∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz))} = {x∣(xA ∧ (∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz)))}
32unieqi 1928 . . 3 {xA∣(∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz))} = {x∣(xA ∧ (∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz)))}
41, 3eqtr 1119 . 2 sup(B, A, R) = {x∣(xA ∧ (∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz)))}
5 supmo.1 . . . . 5 R Or A
65supmo 2156 . . . 4 ∃*x(xA ∧ (∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz)))
7 moabex 1868 . . . 4 (∃*x(xA ∧ (∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz))) → {x∣(xA ∧ (∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz)))} ∈ V)
86, 7ax-mp 6 . . 3 {x∣(xA ∧ (∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz)))} ∈ V
98uniex 1947 . 2 {x∣(xA ∧ (∀yB ¬ xRy ∧ ∀yA (yRx → ∃zB yRz)))} ∈ V
104, 9eqeltr 1159 1 sup(B, A, R) ∈ V
Colors of variables: wff set class
Syntax hints:  ¬ wn 1   → wi 2   ∧ wa 196  ∃*wmo 1008  {cab 1090   ∈ wcel 1092  ∀wral 1201  ∃wrex 1202  {crab 1204  Vcvv 1348  cuni 1919   class class class wbr 2054   Or wor 2059  supcsup 2060
This theorem is referenced by:  sqrval 4729
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-3or 582  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-rab 1208  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-po 2128  df-so 2138  df-sup 2154
metamath.org