Between the two world wars, Stanislaw Lesniewski (1886-1939), created the famous and important system of foundations of mathematics that comprises three deductive theories: Protothetic, Ontology, and Mereology. His research started in 1914 with studies on the general theory of sets (later named `Mereology'). Ontology followed between 1919 and 1921, and was the next step towards an integrated system. In order to combine these two systematically he constructed Protothetic - the system of `first principles'. Together they amount to what Z. Jordan called `... most thorough, original, and philosophically significant attempt to provide a logically secure foundation for the whole of mathematics'. The volume collects many of the most significant commentaries on, and contributions to, Protothetic. A Protothetic Bibliography is included.

William L. (“Bill”) Petersen (1950-2006) was a prominent Diatessaron scholar and New Testament textual critic. This collection brings together thirty-two of his essays, enabling an overview of his impressive and wide-ranging scholarship on Romanos the Melodist, Tatian and his Diatessaron, Patristic studies, and New Testament textual criticism. It will be of value for all those interested in the state and method of these fields of study, on which it offers engaging and sometimes provocative perspectives.

This is a collection of essays on theology, written between 1975 and 1987.

The thought of Meister Eckhart — the Dominican theologian, the preacher, the master of language, the mystic — exudes a remarkable fascination on the modern mind, not the least due to its characteristic interplay of scholastic-academic and vernacular terminology. This volume presents the only book-length study in English of Meister Eckhart the philosopher within the tradition in which his thought is embedded and from which it draws its authority. It shows that even as Eckhart may be justly regarded as a medieval precursor of a modern philosophy of subjectivity, the novelty and continuity of his thought can only be understood in its relation to that of Albert the Great, Aristotle, Dionysius Pseudo-Areopagita, the Liber de causis and the Neoplatonic heritage, Theodoric of Freiberg and Thomas Aquinas as well as Eckhart of Gründig, Jakob of Metz and Johannes Picardi of Lichtenberg. At its center lies the return of the soul, through its detachment from everything corporeal, manifold and temporal, into its ground or spark — into that “something” in the soul where, according to Eckhart, “the ground of God is my ground and my ground is God's ground”. The present translation not only revises the German-language original to take account of recent debates in Eckhart-scholarship, it moreover makes accessible to the non-specialist all Latin and Middle High German material, much of it previously not available in any translation at all. Meister Eckhart: Dominikanischer Theologe, Prediger, Sprachgenie, Mystiker — sein Denken fasziniert den modernen Menschen nicht zuletzt wegen der einprägsamen Wechselwirkung von scholastisch-akademischer Terminologie und deutscher Mundart. Der vorliegende Band ist die einzige englischsprachige Monographie über Meister Eckhart als Philosophen, die ihn im Zusammenhang der ihn maîgeblich bedingenden philosophischen Tradition interpretiert. Auch wenn Eckhart zurecht als Vordenker der modernen Subjektivität gilt, kann man ihn nur im bezug auf Albert den Groîen, Aristoteles, Dionysius Pseudo-Areopagita, den Liber de causis und die neuplatonische Tradition, Dietrich von Freiberg und Thomas von Aquin sowie Eckhart von Gründig, Jakob von Metz und Johannes Picardi von Lichtenberg adäquat verstehen. Im Mittelpunkt dieser Studie steht die Rückkehr der Seele — durch ihre Abgeschiedenheit vom Körperlichen, vom Mannigfaltigen und vom Zeitlichen — in ihren Grund bzw. in den Funken der Seele, wo nach Eckhart “gotes grunt mîn grunt und mîn grunt gotes grunt” ist. Der vorliegende Band revidiert nicht nur die deutschsprachige Original-Studie im Hinblick auf Debatten in der neueren Eckhart-Forschung: Auch dem Nicht-Spezialisten werden sämtliche lateinische und mittelhochdeutsche Quellen durch die Übersetzung ins Englische zugänglich gemacht.