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2.2 Global Mechanisms

The difference between local and global mechanisms is not always clearcut, as demonstrated by the fact that several mechanisms are included in both our global and local lists. In this review we shall use the following criteria for differentiating between local and global mechanisms. If it is necessary to know only the conditions in the immediate vicinity of a galaxy (e.g., the number density encompassing the ten nearest galaxies) the mechanism will be called local. If it is necessary to know the properties of the cluster as a whole (e.g., the position relative to the dynamical center of the cluster) the mechanism will be called global. We should also note that the term global does not imply that the mechanism is operating throughout the cluster.

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