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This is a rare book on a rare topic: it is about 'action' and the Principle of Least Action. A surprisingly well-kept secret, these ideas are at the heart of physical science and engineering. Physics is well known as being concerned with grand conservatory principles (e.g. the conservation of energy) but equally important is the optimisation principle (such as getting somewhere in the shortest time or with the least resistance). This text explains: why an optimisation principle underlies physics, what action is, what 'the Hamiltonian' is and how new insights into energy, space and time arise.

Physical science. --- Lanczos, Cornelius,

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Natural Science Disciplines --- Natural Sciences --- Physical Sciences --- Discipline, Natural Science --- Disciplines, Natural Science --- Natural Science --- Natural Science Discipline --- Physical Science --- Science, Natural --- Science, Physical --- Sciences, Natural --- Sciences, Physical --- Natural Science Disciplines. --- earth sciences --- life sciences --- physical sciences --- Nanotechnology --- Science

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Loin d’être simplement écarté par principe, loin même d’être un thème marginal ou une difficulté à éviter, le vide est tout au long du Moyen Âge l’objet de nombreuses analyses. Les contributions rassemblées dans cet ouvrage examinent quelques-uns des principaux développements qui prennent le vide comme objet ou comme moyen, dans le monde arabe comme dans le monde médiéval latin. Ils traitent du vide en dehors du monde comme du vide à l’intérieur du monde, des différentes définitions du vide, de son rapport au lieu ou bien au mouvement. Ils concernent la physique ou la cosmologie, mais aussi la biologie. Nous avons souhaité dédier ces études à Edward Grant qui, le premier, a mis en lumière l’étendue des problèmes scientifiques traités par les Médiévaux à l’aide du concept de vide.

Metaphysics --- Philosophy of science --- Aesthetics --- anno 500-1499 --- Physical science --- Science, Medieval. --- Vacuum. --- Philosophy of nature --- History --- Science, Medieval --- Vacuum --- Physique --- Sciences médiévales --- Vide (physique) --- Sciences physiques --- Sciences médiévales. --- Philosophie --- Histoire. --- High vacuum technique --- Vacuüm --- Vide (Physique) --- Emptiness (Philosophy) --- Sciences médiévales --- Vide (Philosophie) --- Philosophie de la nature --- Histoire --- Grant, Edward, --- Electric discharges through gases --- Medieval science --- Nature --- Nature, Philosophy of --- Natural theology --- Philosophy --- Physics --- Middle Ages, 500-1500 --- Philosophie. --- Sciences médiévales. --- Physical science - History - To 1500 --- Philosophy of nature - History - To 1500

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Medicine --- Natural Science Disciplines. --- Medicine. --- Health. --- Health --- Clinical sciences --- Medical profession --- Medical Specialities --- Medical Specialties --- Medical Specialty --- Specialities, Medical --- Specialties, Medical --- Specialty, Medical --- Medical Speciality --- Speciality, Medical --- Natural Sciences --- Physical Sciences --- Discipline, Natural Science --- Disciplines, Natural Science --- Natural Science --- Natural Science Discipline --- Physical Science --- Science, Natural --- Science, Physical --- Sciences, Natural --- Sciences, Physical --- Human biology --- Life sciences --- Medical sciences --- Pathology --- Physicians --- Health Workforce

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Religion and science. --- Religion et sciences --- 215 --- Christianity and science --- Geology --- Geology and religion --- Science --- Science and religion --- Godsdienst en wetenschap --- Religious aspects --- Religion and science --- religion --- physical science --- science and religion --- religion and science --- religious thought --- the beginning of the universe --- matter and energy --- physics --- cosmic evolution --- religion and philosophy --- life and intelligence in the universe --- creationism --- intelligent design --- theistic evolution --- Meher Baba --- cosmology