Full Idea
Plato (in 'Parmenides') shows that the theory that 'Eide' are substances, and Kant that space and time are substances, and Bradley that relations are substances, all lead to aninomies.
Gist of Idea
Plato found antinomies in ideas, Kant in space and time, and Bradley in relations
Source
report of Plato (Parmenides [c.366 BCE]) by Gilbert Ryle - Are there propositions? 'Objections'
Book Reference
Ryle,Gilbert: 'Collected Essays 2 1929-1968' [Routledge 2009], p.28