theorem Th134:
  Union <*X,Y*> = X \/ Y & meet <*X,Y*> = X /\ Y
proof
  thus Union <*X,Y*> = union rng <*X,Y*>
    .= union {X,Y} by FINSEQ_2:127
    .= X \/ Y by ZFMISC_1:75;
  thus meet <*X,Y*> = meet {X,Y} by FINSEQ_2:127
    .= X /\ Y by SETFAM_1:11;
end;
