  The idea is that in (3) the ‘mere’ absence of Annambhaṭṭa is located in the room, whereas in (4) a qualified absence (of Annambhaṭṭa as qualified by authorhood) is located in the room. Do (3) and (4) really have distinct logical forms? Perhaps we find here a realisation that nominal expressions such as “The author of The Manual of Reason” have two distinct logical functions, namely those of referring to an individual and describing an individual via his properties. (4) can thus be read either as asserting the same as (3), that Annambhaṭṭa is not in the room, or as saying that the author of The Manual of Reason, whoever it or she is, is not in the room, i.e. that the properties ‘being the author of The Manual of Reason” and “being in the room” are not collocated. If that is the sense in which (4) involves a qualified absence, then (3) and (4) do have different logical forms.