(quote _,List,List)

w_{i,j,...} -- selects entries from a list or sequence w.

i1 : w = {a,b,c,d,e,f,g,h};
i2 : w_{1,3,4}

o2 = {b, d, e}

o2 : List

We can use this operation to compute composition of permutations represented as lists.

i3 : {4,2,3,1,0} _ {2,1,3,4,0}

o3 = {3, 2, 1, 0, 4}

o3 : List

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