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Philonides (Greek: Φιλωνίδης, c. 200 – c. 130 BC) of Laodicea in Syria, was an Epicurean philosopher and mathematician who lived in the Seleucid court during the reigns of Antiochus IV Epiphanes and Demetrius I Soter.

He was known principally from a Life of Philonides which was discovered among the charred papyrus scrolls at the Villa of the Papyri at Herculaneum.[1] Philonides was born into a family with good connections with the Seleucid court.[2] He is said to have been taught by Eudemus and Dionysodorus the mathematician.[3] Philonides attempted to convert Antiochus IV Epiphanes to Epicureanism, and later instructed his nephew, Demetrius I Soter, in philosophy.[2] Philonides was highly honoured in the court, and he is also known from various stone inscriptions.[4]

He was renowned as a mathematician, and is mentioned by Apollonius of Perga in the preface to the second book of his Conics.[3][5]

Philonides was a zealous collector of the works of Epicurus and his colleagues, and is said to have published over 100 treatises, probably compilations of the works he collected.[6]

Vita Philonidi, PHerc. 1044
Dov Gera, (1998), Judaea and Mediterranean Politics, 219 to 161 B.C.E., page 274. BRILL
Ian Mueller, Geometry and scepticism, in Jonathan Barnes, (2005), Science and Speculation: Studies in Hellenistic Theory and Practice, page 94. Cambridge University Press.
Dewitt, (1999), Epicurus and His Philosophy, pages 119–120. U of Minnesota Press
Apollonius, I 192.7–11
H. Gregory Snyder, (2000), Teachers and Texts in the Ancient World, pages 49–50. Routledge


Ancient Greek and Hellenistic mathematics (Euclidean geometry)
Anaxagoras Anthemius Archytas Aristaeus the Elder Aristarchus Apollonius Archimedes Autolycus Bion Bryson Callippus Carpus Chrysippus Cleomedes Conon Ctesibius Democritus Dicaearchus Diocles Diophantus Dinostratus Dionysodorus Domninus Eratosthenes Eudemus Euclid Eudoxus Eutocius Geminus Heliodorus Heron Hipparchus Hippasus Hippias Hippocrates Hypatia Hypsicles Isidore of Miletus Leon Marinus Menaechmus Menelaus Metrodorus Nicomachus Nicomedes Nicoteles Oenopides Pappus Perseus Philolaus Philon Philonides Porphyry Posidonius Proclus Ptolemy Pythagoras Serenus Simplicius Sosigenes Sporus Thales Theaetetus Theano Theodorus Theodosius Theon of Alexandria Theon of Smyrna Thymaridas Xenocrates Zeno of Elea Zeno of Sidon Zenodorus
Almagest Archimedes Palimpsest Arithmetica Conics (Apollonius) Catoptrics Data (Euclid) Elements (Euclid) Measurement of a Circle On Conoids and Spheroids On the Sizes and Distances (Aristarchus) On Sizes and Distances (Hipparchus) On the Moving Sphere (Autolycus) Euclid's Optics On Spirals On the Sphere and Cylinder Ostomachion Planisphaerium Sphaerics The Quadrature of the Parabola The Sand Reckoner
Angle trisection Doubling the cube Squaring the circle Problem of Apollonius
Circles of Apollonius
Apollonian circles Apollonian gasket Circumscribed circle Commensurability Diophantine equation Doctrine of proportionality Golden ratio Greek numerals Incircle and excircles of a triangle Method of exhaustion Parallel postulate Platonic solid Lune of Hippocrates Quadratrix of Hippias Regular polygon Straightedge and compass construction Triangle center
In Elements
Angle bisector theorem Exterior angle theorem Euclidean algorithm Euclid's theorem Geometric mean theorem Greek geometric algebra Hinge theorem Inscribed angle theorem Intercept theorem Pons asinorum Pythagorean theorem Thales's theorem Theorem of the gnomon
Apollonius's theorem
Aristarchus's inequality Crossbar theorem Heron's formula Irrational numbers Menelaus's theorem Pappus's area theorem Problem II.8 of Arithmetica Ptolemy's inequality Ptolemy's table of chords Ptolemy's theorem Spiral of Theodorus
Cyrene Library of Alexandria Platonic Academy
Ancient Greek astronomy Greek numerals Latin translations of the 12th century Neusis construction

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