Theaetetus of Athens (/ˌθiːɪˈtiːtəs/; Greek: Θεαίτητος; c. 417 – c. 369 BC), possibly the son of Euphronius of the Athenian deme Sunium, was a Greek mathematician. His principal contributions were on irrational lengths, which was included in Book X of Euclid's Elements and proving that there are precisely five regular convex polyhedra. A friend of Socrates and Plato, he is the central character in Plato's eponymous Socratic dialogue. Theaetetus, like Plato, was a student of the Greek mathematician Theodorus of Cyrene. Cyrene was a prosperous Greek colony on the coast of North Africa, in what is now Libya, on the eastern end of the Gulf of Sidra. Theodorus had explored the theory of incommensurable quantities, and Theaetetus continued those studies with great enthusiasm; specifically, he classified various forms of irrational numbers according to the way they are expressed as square roots. This theory is presented in great detail in Book X of Euclid's Elements. Theaetetus was one of the few Greek mathematicians who was actually a native of Athens. Most Greek mathematicians of antiquity came from the numerous Greek cities scattered around the Ionian coast, the Black Sea and the whole Mediterranean basin. He evidently resembled Socrates in the snubness of his nose and bulging of his eyes. This and most of what is known of him comes from Plato, who named a dialogue after him, the Theaetetus. He apparently died from wounds and dysentery on his way home after fighting in an Athenian battle at Corinth, now presumed to have occurred in 369 BC; some scholars argue alternately for 391 BC as his date of death, the date of an earlier battle at Corinth. The crater Theaetetus on the Moon is named after him. (Wikipedia).
http://www.teachastronomy.com/ Hipparchus was a major astronomer of the second century BC. He had an observatory on the island of Rhodes. From him we have the first use of celestial coordinates and the first star catalog. He also invented the magnitude system for measuring the relative
From playlist 03. Concepts and History of Astronomy and Physics
Plato on Knowledge - The Meno & Theaetetus (History of Philosophy)
Peter Adamson discusses Plato's dialogues the Meno and the Theaetetus, which address various epistemological topics, including Meno's paradox, Plato's theory of recollection, the nature of knowledge, relativism, and the difference between knowledge and true belief (e.g. what must be added
From playlist Socrates & Plato
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From playlist Science Unplugged: Physics
If God Knows the Future, What is Free Will? | Episode 710 | Closer To Truth
If God is infallible and knows the future perfectly, then God knows what I will do at every moment from my birth to my death. So where's my free will? Featuring interviews with Alvin Plantinga, Peter van Inwagen, Thomas Flint, and Dean Zimmerman. Season 7, Episode 10 - #CloserToTruth ▶Re
From playlist Big Questions About God - Closer To Truth - Core Topic
Mechanics and curves | Math History | NJ Wildberger
The laws of motion as set out by Newton built upon work of Oresme, Galileo and others on dynamics, and the relations between distance, velocity and acceleration in trajectories. With Newton's laws and the calculus, a whole new arena of practical and theoretical investigations opened up to
From playlist MathHistory: A course in the History of Mathematics
Number theory and algebra in Asia (a) | Math History | NJ Wildberger
After the later Alexandrian mathematicians Ptolemy and Diophantus, Greek mathematics went into decline and the focus shifted eastward. This lecture discusses some aspects of Chinese, Indian and Arab mathematics, in particular the interest in number theory: Pell's equation, the Chinese rema
From playlist MathHistory: A course in the History of Mathematics
The Philosophy of Language - John Searle & Bryan Magee (1978)
In this program, John Searle discusses the philosophy of language with Bryan Magee. This is from a 1978 series on Modern Philosophy called Men of Ideas. #Philosophy #BryanMagee #Searle
From playlist Bryan Magee Interviews - Modern Philosophy: Men of Ideas (1977-1978)
Number theory and algebra in Asia (b) | Math History | NJ Wildberger
After the later Alexandrian mathematicians Ptolemy and Diophantus, Greek mathematics went into decline and the focus shifted eastward. This lecture discusses some aspects of Chinese, Indian and Arab mathematics, in particular the interest in number theory (Pell's equation, the Chinese rema
From playlist MathHistory: A course in the History of Mathematics
Vidéo réalisée avec le soutien du projet AAMOT de l’ERC
From playlist Mathematics is a long conversation: a celebration of Barry Mazur
Lecture 18, Gregory of Nyssa, of PHL 354/CTI 335, History of Christian Philosophy, The University of Texas at Austin, Spring 2013
From playlist UT Austin: History of Christian Philosophy | CosmoLearning.org Philosophy
http://www.teachastronomy.com/ Pythagoras was one of the most influential thinkers in history. This Greek philosopher and mathematician came up with the idea that numbers were the basis of everything. There is no written record, and nothing about Pythagoras survives in writing. He essen
From playlist 02. Ancient Astronomy and Celestial Phenomena
The Riemann integral for functions of two variables -- Calculus III
This lecture is on Calculus III. It follows Part III of the book Calculus Illustrated by Peter Saveliev. The text of the book can be found at http://calculus123.com.
From playlist Calculus III
http://www.teachastronomy.com/ Thales was a philosopher who lived in the 6th century B.C. in Miletus, in what is now Turkey. No written work by Thales survives, but we know that he kept accurate eclipse records and he speculated about astronomy. He decided that the source of all things w
From playlist 02. Ancient Astronomy and Celestial Phenomena
Greek Mathematics: Pythagoras and His Followers
Welcome to the History of Greek Mathematics mini-series! This series is a short introduction to Math History as a subject and the some of the important theorems created in ancient Greece. You are watching the second video in the series. If this series interested you check out our blog for
From playlist The History of Greek Mathematics: Math History
Jordan Peterson & The Meaning of Life | Philosophy Tube
Why this is Hell, nor are we out of it! Patreon: http://www.patreon.com/PhilosophyTube Subscribe! http://tinyurl.com/pr99a46 Paypal.me/PhilosophyTube Wanna get me a gift for the show? http://amzn.eu/5JAYdOd Check out my other videos on: Brexit: What is Democracy? https://www.youtube.co
From playlist The Main Show
Physical Science 1.1d - Copernicus Galileo Newton
A look at the ideas of Copernicus, Galileo, and Newton, and why they were revolutionary. These people put science on an experimental footing and ushered in the era of classical physics. From the Physical Science course by Derek Owens.
From playlist Physical Science Chapter 1 (Complete chapter)
Taylor Carman - “Narrative and Pictorial Truth”
Taylor Carman is Professor of Philosophy at Barnard College, Columbia University. He is the author of Heidegger’s Analytic: Interpretation, Discourse, and Authenticity in Being and Time and Merleau-Ponty and coeditor of The Cambridge Companion to Merleau-Ponty. He has written on topics in
From playlist Franke Lectures in the Humanities
Taming a Monster: The Master of Integration
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From playlist Integrals
Teach Astronomy - Early Greek Ideas
http://www.teachastronomy.com/ The early Greek philosophers had none of the tools of modern science. They did not have the machines with which to probe the atom. They did not have telescopes. They didn't have modern technology of any kind, and yet with logic and mathematics they were ab
From playlist 02. Ancient Astronomy and Celestial Phenomena
ICM 2006 Closing Round Table Are pure and applied mathematics drifting apart? Intervention by John Ball (Slides https://www.mathunion.org/fileadmin/IMU/Videos/ICM2006/tars/table2006_ball.pdf) Intervention by Lennart Carleson (Slides https://www.mathunion.org/fileadmin/IMU/Videos/ICM2006/
From playlist Number Theory