logic

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Symbol for the OR gate

The conditional (p > q)

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Plato (left) and Aristotle, detail from School of Athens, fresco by Raphael, 1508-11; in the Stanza della Segnatura, the Vatican. Plato points to the heavens and the realm of Forms, Aristotle to the earth and the realm of things.

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Aristotle (384-322 BC), Ancient Greek philosopher and scientist. One of the most influential philosophers in the history of Western thought, Aristotle established the foundations for the modern scientific method of enquiry. Statue

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Aristotle statue located at Stageira of Greece

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Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro

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Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

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Watergate scandal. Richard M. Nixon. President Nixon gives a press conference and talks to the press, March 12, 1971.

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Srinivasa Ramanujan, Indian mathematician and autodidact.

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Scottish fold cat. A genetic mutation caused (in the original cat-1961) the ears to bend forward and down.

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logic: Media

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Gottlob Frege

Gottlob Frege

Gottlob Frege.

Courtesy of the Universitatsbibliothek, Jena, Ger.

Symbol for the AND gate

Symbol for the NOT gate

Symbol for the OR gate

The conditional (p > q)

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