grammar
t :: Tm ::=                                        {{ com terms: }}
  | inert T                       ::   :: Inert      {{ com inert element of type [[T]] }}
                                                     {{ tex [[inert]]_{[[T]]} }}

defns
Jtype :: '' ::= 

defn
G |- t : T :: :: typing :: T_ {{ com Typing }} by


---------------- :: Inert
G |- inert T : T
