Partially Excerpted Conversation: Levels of Emergence

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This is an expanded excerpt from the emergence discussion from the Partially Examined Life Citizen Commons.  We studied the classic More is Different: Broken Symmetry and the Hierarchical Nature of Science by P.W. Anderson.  Their discussion software butchered my reply, so I figured I should clean it up by reposting it here.
It is difficult to have productive disagreements around “emergence” and “reductionism” because of the vague, confusing, and downright inconsistent way these terms are used. To help clear things up, I propose we talk in terms of the following levels.
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