Three Nordic Neo-Aristotelians and the First Doorkeeper of Logic

I discuss the views on logic held by three early Nordic neo-Aristotelians — the Swedes Johannes Canuti Lenaeus (1573–1669) and Johannes Rudbeckius (1581–1646), and the Dane Caspar Bartholin (1585–1629). They all studied in Wittenberg (enrolled respectively in 1597, 1601, and 1604) and were exponents of protestant (Lutheran) scholasticism. The works I utilize are Janitores logici bini (1607) and Enchiridion logicum (1608) by Bartholin; Logica (1625) and Controversiae logices (1629) by Rudbeckius; and Logica peripatetica (1633) by Lenaeus. Rudbeckius’s and Lenaeus’s books were published much later than they were prepared. Rudbeckius wrote the first versions of his books in 1606, and the material for Lenaeus’s book had been prepared by 1607. Bartholin calls the treatment of the nature of logic the “first doorkeeper of logic”. To compare the views of the three neo-Aristotelians on this topic, I systematically investigate what they have to say about second notions, the subject of logic, the internal and external goal of logic, and the definition of logic. I also compare their approaches with those of Jacob Martini (teacher of Rudbeckius and Bartholin) and Iacopo Zabarella (an intellectual predecessor of all three).