RESULTATIVE PAST. The Present Perfect is also used in reference to a past event to imply that the result of that event is still operative at the present time. This meaning is clearest with ‘transitional event verbs’ (§35B), describing the switch from one state to another. The resultant (and present) state implied by the Perfect is indicated in brackets in these typical examples:
The taxi has arrived (i.e. ‘The taxi is now here’).
She has been given a camera (‘She now has the camera’).
I’ve recovered from my illness (‘I’m now well again’).
In other examples, the resultative implication is still there, even though it is not quite so obvious from the verb’s meaning:
I’ve taken a shower (‘So I’m now clean’).
He’s cut his hand with a knife (‘The cut is still there, i.e. has not yet healed’).
The resultative meaning needs no support from adverbials. It is sometimes difficult to distinguish from the recent indefinite past use (§57): in fact, it is arguably a special case of the recent indefinite past, in which there is the additional resultative inference. One may argue, for instance, that the question Have you seen my trainers? is really a question about the present consequences of seeing the trainers; i.e. ‘Do you know where they are?’
-- Leech, Geoffrey N. 2004. Meaning and the English Verb. Harlow, England: Pearson/Longman.
I'm wondering why it's there is the additional resultative inference, not there is an additional resultative inference.
From time to time, I run across this pattern of 'there is/are the noun', but I have no idea how it's used.