The term "indices" is used often in Mathematica. As is "levelspec". Is there a documentation page which defines the meaning or interpretation of these words, or indeed the terminology of Mathematica?
For instance, in the guide/ElementsOfLists we learn that indices may be different than positions. In the help for Cases, we learn that Cases uses standard levelspec definition where n is interpreted to mean all parts of an expression specified by n indices.
Putting these thoughts together, does this mean that a list element is addressed by it's {row, column, ...} and each element of this address list is an index, the plural of which defines the use of "indices". And that level spec is the depth of these indices ie. levelspec at depth p = Length[ {1,2,3,..,p, ...}] or element of a list at index {1,2,3,..,p, ...} ?
Is the use of n in Cases[v,test,n] where n=2 to mean all combinations of { ...x,y,...}, where x,y means any adjacent pair of 2 indices.
Not sure if the last paragraph can be understood, if not don't dwell on it.
Thanks, John
