Full Idea
Three main theories of the truth of indicative conditionals are Materialism (the conditions are the same as for the material conditional), Idealism (identifying assertability with truth-value), and Nihilism (no truth, just assertability).
Gist of Idea
Three conditionals theories: Materialism (material conditional), Idealism (true=assertable), Nihilism (no truth)
Source
John P. Burgess (Philosophical Logic [2009], 4.3)
Book Reference
Burgess,John P.: 'Philosophical Logic' [Princeton 2009], p.78
Related Idea
Idea 6879 'Material implication' is defined as 'not(p and not-q)', but seems to imply a connection between p and q [Mautner]