Editing Ramsey–Lewis method (section)

==Sources==
*{{Citation| first=Giuliano | last= Toraldo di Francia| title=The Investigation of the Physical World| location=Cambridge| publisher=Cambridge University Press| year=1981| isbn=0-521-29925-X |page=74 |chapter=2. The physics of the reversible §2.8 Do magnetic charges exist? |chapter-url=https://archive.org/details/investigationofp0000tora/page/74/mode/1up |quote=... At this point, we can mention a procedure, usually named after F.P. Ramsey (Ramsey, 1954; see also Sneed, 1971, Chaps, 3 and 4). We should also try to discuss only the gist of the procedure rather than all the technical details. Every time a theoretical term appears in a theory one should substitute a variable ''x'' for it, and the theory should be preceded by the expression "there exists a certain thing ''x'', such that."}}
**Originally published as  {{citation |author-mask=1 |first=Giuliano |last=Toraldo di Francia |title=L'Indagine del Mondo Fisico |publisher=Giulio Einaudi |year=1976 |isbn=9788806447502 |oclc=762196245 |series=Nuova biblioteca scientifica Einaudi |url=}}
*{{Citation|authorlink=David Lewis (philosopher)|last=Lewis|first=David |year=1970|title=How to define theoretical terms |journal= Journal of Philosophy |volume=67 |issue=13 |pages=426–446 |doi=10.2307/2023861 |jstor=2023861}} 
*{{Citation|authorlink=Frank P. Ramsey|last=Ramsey|first=Frank P. |year=2013 |orig-year=1931 |title=The Foundations of Mathematics | publisher=Taylor & Francis |isbn=978-1-134-52810-3}} as cited by {{harvnb|Toraldo di Francia|1981|p=74}}