ἔγραψέ μοι γάρ ... τὰ νῦν οὖν γράφω σοι. οὖν and γάρ as inferential and elaborative discourse markers in Greek papyrus letters (I – IV AD)

I analyse the use of the particles οὖν and γάρ in a corpus of documentary texts ranging from the first to the fourth century AD. I attempt to answer three main research questions: (i) with what frequency are οὖν and γάρ used; was one of these particles used more frequently than the other?; (ii) what are the functional/syntactic similarities and differences between the two particles; (iii) are there signs of functional development? My observations are framed within ‘discourse marker theory’, whereby οὖν and γάρ are viewed as ‘inferential’ and ‘elaborative’ discourse markers.