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  2. Anaximander - Wikipedia

    en.wikipedia.org/wiki/Anaximander

    He proposed the theory of the apeiron in direct response to the earlier theory of his teacher, Thales, who had claimed that the primary substance was water. The notion of temporal infinity was familiar to the Greek mind from remote antiquity in the religious concept of immortality, and Anaximander's description was in terms appropriate to this ...

  3. Unity of opposites - Wikipedia

    en.wikipedia.org/wiki/Unity_of_opposites

    Anaximander posited that every element had an opposite, or was connected to an opposite (water is cold, fire is hot). Thus, the material world was said to be composed of an infinite, boundless apeiron from which arose the elements (earth, air, fire, water) and pairs of opposites (hot/cold, wet/dry). There was, according to Anaximander, a ...

  4. Anaximenes of Miletus - Wikipedia

    en.wikipedia.org/wiki/Anaximenes_of_Miletus

    Air as the arche is a limitless concept, which resembled Anaximander's theory that the arche was the abstract infinite that he called apeiron (Ancient Greek: ἄπειρον, lit. 'unlimited, 'boundless'). At the same time, air as the arche was a defined substance, which resembled the theory of Thales that the arche was water. [35]

  5. Apeiron - Wikipedia

    en.wikipedia.org/wiki/Apeiron

    The apeiron is central to the cosmological theory created by Anaximander, a 6th-century BC pre-Socratic Greek philosopher whose work is mostly lost. From the few existing fragments, we learn that he believed the beginning or ultimate reality is eternal and infinite, or boundless (apeiron), subject to neither old age nor decay, which perpetually yields fresh materials from which everything we ...

  6. Spontaneous generation - Wikipedia

    en.wikipedia.org/wiki/Spontaneous_generation

    The Greek philosopher Anaximenes, a pupil of Anaximander, thought that air was the element that imparted life and endowed creatures with motion and thought. He proposed that plants and animals, including human beings, arose from a primordial terrestrial slime, a mixture of earth and water, combined with the sun's heat.

  7. Ionian school (philosophy) - Wikipedia

    en.wikipedia.org/wiki/Ionian_School_(philosophy)

    Anaximander (Greek: Ἀναξίμανδρος, Anaximandros) (c. 610 – c. 546 BCE) wrote a cosmological work, little of which remains.From the few extant fragments, we learn that he believed the beginning or first principle (arche, a word first found in Anaximander's writings, and which he probably invented) is an endless, unlimited mass (), subject to neither old age nor decay, which ...

  8. First principle - Wikipedia

    en.wikipedia.org/wiki/First_principle

    Anaximenes, Anaximander's pupil, advanced yet another theory. He returns to the elemental theory, but this time posits air, rather than water, as the arche and ascribes to it divine attributes. He was the first recorded philosopher who provided a theory of change and supported it with observation.

  9. Philosophy of matter - Wikipedia

    en.wikipedia.org/wiki/Philosophy_of_matter

    Thales's theory was refuted by his pupil and successor, Anaximander. Anaximander noted that water could not be the arche because it could not give rise to its opposite, fire. Anaximander claimed that none of the elements (earth, fire, air, water) could be arche for the same reason. Instead, he proposed the existence of the apeiron, an ...