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I am trying to verbally describe how to evaluate a nested group of expressions. What would you call the most-interior group of parentheses as the expression is evaluated?

(((a-b)*(c+d)) - e)

In graph-theory this would be a leaf-node in the tree-representation of the expression. But I'm looking for a term that is not specific to graph-theory. The "next order of operation" comes to mind but that's not quite right, as I'm just looking at the parentheses grouping.

In the case above, I want to identify the most-interior groupings as (a-b) and (c+d). Is there a better way to refer to these other than "most-interior grouping" or leaf nodes of a tree graph?

SheepPlusPlus
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  • The more I read the question, the less I understand it, sorry. In particular, the "next order of operation" is puzzling. What is the most-interior group of parentheses in your example ? –  Aug 09 '18 at 18:09
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    the most-interior group?! There are many such groups possible ... e.g. in your example, there are two – Bram28 Aug 09 '18 at 18:16

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