Full Idea
Paderewski cases are cases in which a subject associates two distinct files with a single name. Inverse Paderewski cases are cases in which there are two names but the subject associates them with a single file.
Clarification
The two Paderewski files are 'Polish President' and 'famous pianist' (same man)
Gist of Idea
Files can be confused, if two files correctly have a single name, or one file has two names
Source
François Recanati (Mental Files [2012], 10.1)
Book Reference
Recanati,François: 'Mental Files' [OUP 2012], p.116
A Reaction
In the inverse there are two people with the same name, and someone thinks they are one person (with their combined virtues and vices). E.g. Einstein the famous physicist, and Einstein the famous musicologist. What a man!