val index_obj: #NCic.status -> state -> NUri.uri -> state
val is_equation:
#NCic.status -> NCic.metasenv -> NCic.substitution -> NCic.context ->
val index_obj: #NCic.status -> state -> NUri.uri -> state
val is_equation:
#NCic.status -> NCic.metasenv -> NCic.substitution -> NCic.context ->