Buridan explicitly holds the form/matter distinction but does not hold that form is what makes a valid argument valid.

The view that the form of a consequence/argument pertains to its syncategorematic terms while its matter pertains to its categorematic terms is presupposed in both earlier and subsequent texts, but here with Buridan it receives a rare explicit formulation. A modern version of this idea still survives, in the form of the doctrine of the logical form of arguments and the modern preoccupation with logical constants (Read 1994; Dutilh Novaes 2012a; entry on logical constants of this encyclopedia). H