Full Idea
Boolos discovered that any sentence of monadic second-order logic can be translated into plural first-order logic.
Gist of Idea
Any sentence of monadic second-order logic can be translated into plural first-order logic
Source
report of George Boolos (To be is to be the value of a variable.. [1984], §1) by Øystein Linnebo - Plural Quantification Exposed p.74
Book Reference
-: 'Nous' [-], p.74