Congratulations to Scott Williams, trinities contributor and newly minted Oxford University PhD in Theology, on his forthcoming paper:
‘Henry of Ghent on Real Relations and the Trinity: The Case for Numerical Sameness Without Identity’, in: Recherches de Théologie et Philosophie Médiévales 79.1 (2012), will be published.
Here is his abstract:
I argue that there is a hitherto unrecognized connection between Henry of Ghent’s general theory of real relations and his Trinitarian theology, namely the notion of numerical sameness without identity.
This last notion can be traced back to Aristotle, and pops up through the middle ages: the basic idea is that an x and y can differ, and so fail to be identical, and yet be “numerically one”. Myself, I deny that there’s any such relation, but some disagree, most notably Mike Rea and Jeff Brower. Here’s a relevant 2007 post featuring Billary.
Theories of real relations… well, Scott should get on here and explain that one! Medieval theories of relations are best left to the specialists.