Why feynman diagrams represent

Abstract
There are two distinct interpretations of the role that Feynman diagrams play in physics: (i) they are calculational devices, a type of notation designed to keep track of complicated mathematical expressions; and (ii) they are representational devices, a type of picture. I argue that Feynman diagrams not only have a calculational function but also represent: they are in some sense pictures. I defend my view through addressing two objections and in so doing I offer an account of representation that explains why Feynman diagrams represent. The account that I advocate is a version of that defended by Kendall Walton, which provides us with a basic characterization of the way that representations in general work and is particularly useful for understanding distinctively pictorial representations - in Walton's terms, depictions. The question of the epistemic function of Feynman diagrams as pictorial representations is left for another time.
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Mario Bacelar Valente (2011). Are Virtual Quanta Nothing but Formal Tools? International Studies in the Philosophy of Science 25 (1):39 - 53.
Ari Gross (2012). Pictures and Pedagogy: The Role of Diagrams in Feynman's Early Lectures. Studies in History and Philosophy of Science Part B 43 (3):184-194.
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