Full Idea
General truths are a species of negative truth, 'no more' truths, asserting that there are no more men than the mortal ones, no more ravens than the black ones.
Gist of Idea
General truths are a type of negative truth, saying there are no more ravens than black ones
Source
David M. Armstrong (Truth and Truthmakers [2004], 05.1)
Book Reference
Armstrong,D.M.: 'Truth and Truthmakers' [CUP 2004], p.53
A Reaction
He goes on to distinguish between 'absences' and 'limits' in this area.