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