Branislav Petronijević

Branislav Petronijević (Serbian Cyrillic: Бранислав Петронијевић; also spelled Petronievics; 6 April 1875 – 4 March 1954) was a Serbian philosopher and paleontologist, and a professor at the University of Belgrade. He is regarded as one of the most prominent Serbian philosophers of the first half of the 20th century and played a central role in the institutionalization of academic philosophy in Serbia and Yugoslavia.

Trained in Vienna and Leipzig under figures such as Ludwig Boltzmann, Johannes Volkelt and Wilhelm Wundt, Petronijević developed an original metaphysical system that he called "monopluralism", a synthesis of Spinoza's substance monism and Leibniz's monadological pluralism shaped by the idealist tradition of Hermann Lotze and Eduard von Hartmann. In his self-described "empirio-rationalist" epistemology he held that immediate experience both presents reality as it is and yields the basic logical and metaphysical axioms, including the principle of sufficient reason, from which he sought to derive an "absolute metaphysics". His major systematic works, notably Prinzipien der Metaphysik (Principles of metaphysics, 1904–1911), develop a discrete, finitist conception of space built from simple qualitative points, a "hypermetaphysics" concerned with the most general oppositions of the One and the Many, and a broader program that also encompasses the foundations of mathematics, experimental psychology, aesthetics, and practical philosophy.

Alongside his metaphysical and epistemological writings, Petronijević made contributions to the philosophy of science and to natural history, publishing on universal evolution and proposing an interpretation of Dollo's law as well as what he called the Law of Non-correlative Evolution. In paleontology he was among the early specialists on Archaeopteryx, introducing the genus Archaeornis and several related names. However, later work has generally not adopted these taxonomic arrangements.

A participant in the Serbian army's Great Retreat in World War I, he served as a war correspondent, lectured in Paris and London, and wrote the biographical preface to the 1922 English edition of Roger Joseph Boscovich's A Theory of Natural Philosophy. He was a full member and later secretary of the Serbian Academy of Sciences and Arts, co-founded the Serbian Philosophical Society, mentored the philosopher Ksenija Atanasijević, and was nominated for the Nobel Prize in Literature in 1941 and 1947.