By Henry David Thoreau
Henry David Thoreau ne s’est jamais contenté d’admirer los angeles Nature. Depuis sa retraite au milieu des bois, à Walden en 1845, jusqu’à ses longues promenades dans les forêts de l. a. Nouvelle-Angleterre, il n’a european de cesse de los angeles parcourir. Jour après jour, il a scrupuleusement consigné dans son Journal, dont « Balade d’hiver » (1846) et « Couleurs d’automne » (1862) sont tirés, chaque détail observé au cours de ses tours et l. a. moindre edition du paysage.
Sensible aux saisons du déclin, périodes propres à l. a. méditation, ce philosophe de los angeles nature s’emploie à décrypter les signes d’une harmonie universelle au sein de laquelle l’homme doit trouver sa position.
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Additional info for Balade d'hiver, couleurs d'automne (La Petite Collection)
Methods based on symmetry are commonly used in physics since the property of symmetry is closely linked to the structural organization of matter, which is by essence of a geometrical nature. Thus, the laws of conservation of matter are associated with the properties of symmetry of the system. A law of conservation of matter is considered to represent a fundamental property of the system to such an extent that, in physical theories, the knowledge of the laws of conservation is considered sufficient to explain the system.
The second question concerns the existence of variations with respect to space. Some equations contain terms, such as dX/dx, d2X/dx2, and so on. We then have partial differential equations. As in the case involving variations with respect to time, these equations represent reproducible local, spatiotemporal relationships. qxd 24/08/04 11:05 AM Page 53 Physical and Biological Interactions higher than the second order play no role in the mathematical representation of physical phenomena. An example of formalization: the phenomenon of diffusion and the propagation of heat A classic example of an equation of the type considered above is the reaction-diffusion equation.
This is analogous to the way the property of symmetry leads to the structuring of a molecular system with its different energy levels, though without any hierarchical organization. Thus, the properties of non-symmetry and non-locality lead to a novel situation in theoretical biology, obliging us to formulate physiological functions incorporating the idea of a hierarchical organization that must be reflected by the mathematical solution of the dynamic biological system. Another question that may be asked is what happens when a given biological unit acts as a source for certain products and as a sink for others?