A What is meant by pruning and enrichment?

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Pruning refers to the deletion of elements, while enrichment involves enhancing or increasing weights. The discussion centers on the PERM algorithm, questioning whether pruning involves removing entire polymer chains or just specific beads within them. It also raises inquiries about whether the enrichment process increases the weights of entire polymers or individual beads. Additionally, there is curiosity about what replaces the modified pruned weights and a reference to Grassberger's original article for further context. Understanding these distinctions is crucial for grasping the implications of the PERM algorithm in polymer studies.
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What does it mean by pruning and enrichment in the case of Rosenbluth method?
As far as I understand:

  1. Pruning means deleting something.
  2. Enrich means to enhance/increase weight.
Now my question is, in the case of the PERM algorithm,

  1. Are we deleting some polymers chains? Or, are we deleting some beads in all polymer chains?
  2. Are we increasing the weights of some polymers? Or, are we increasing the weights of some beads/atoms of all polymers?
When we are modifying the pruned weights, what are we replacing them with?
 
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