Russell and richard brinkley on the unity of the proposition

Between 1903 and 1918 Russell made a number of attempts to understand the unity of the proposition, but his attempts all foundered on his failure clearly to distinguish between different senses in which the relation R might be said to relate a and b in the proposition aRb: he failed to distinguish between the relation as truth-maker and the relation as unifier, and consequently committed himself again and again to the unacceptable consequence that only true propositions are genuinely unified. There is an anticipation of this confusion in the writings of the fourteenth-century philosopher Richard Brinkley