Shameless self-promotion: SEP entry on medieval theories of consequence

I realize I'm probably pushing my luck a bit too far, but here's a bit of shameless self-promotion: my entry on medieval theories of consequence for the Stanford Encyclopedia of Philosophy is now online. Naturally, it is essentially a historical piece, but (I think) also quite relevant for contemporary debates on the notion of logical consequence. Here's a bit from the introduction:

Taken as a whole, medieval theories of consequence represent the first sustained attempt at adopting a sentential/propositional perspective since the Stoics in Greek antiquity, and — unlike Stoic logic, which had little historical influence — provide the historical background for subsequent developments leading to the birth of modern logic in the 19^th century. Indeed, it will be argued that the medieval concept of consequentia (in its different versions) is the main precursor of the modern concept of logical consequence.