mlsubsection23.25ex plus 1ex minus .2ex1.5ex plus .2ex
 set_formation(y): tok 
  rule.
universe_intro_set_independent: rule.
set_formation_independent: rule.
mlsubsection23.25ex plus 1ex minus .2ex1.5ex plus .2ex
 set_equality_element(level y): int 
  tok 
  rule.
set_intro_independent: rule.
set_equality_element: rule.
mlsubsection23.25ex plus 1ex minus .2ex1.5ex plus .2ex
mlsubsection23.25ex plus 1ex minus .2ex1.5ex plus .2ex