Abstract
In this paper I challenge two widespread convictions about unification in physics: (1) unification is an aim of physics and (2) unification is driven by metaphysical or metatheoretical presuppositions. I call these external explanations of why there is unification in physics. Against this, I claim that (a) unification is a by-product of physical research and (b) unification is driven by basic methodological strategies of physics alone (without any appeal to metaphysical or metatheoretical presuppositions). I call this an internal (or methodological) explanation of why there is unification in physics. To support my claims, I will investigate the actual practice undertaken in physics in paradigmatic examples of unification.
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