Full Idea
One of the assumptions of logical atomism is that all structural properties, all complex properties, are composed of simple properties and relations. ...But does the totality of the simple properties consist of the only possible simple properties?
Gist of Idea
Logical atomism builds on the simple properties, but are they the only possible properties?
Source
David M. Armstrong (Truth and Truthmakers [2004], 07.3)
Book Reference
Armstrong,D.M.: 'Truth and Truthmakers' [CUP 2004], p.89
A Reaction
This refers to what Lewis calls 'alien' properties - possible properties that cannot even be constructed from actual properties. Armstrong's question is about the truthmakers for such things. A bit speculative...