v_i

v_i -- produce the i-th entry of a vector or module element v. 

     i1 = R = ZZ/101[a..f]
     
     o1 = R
     
     o1 : PolynomialRing
     
     i2 = v = vector {a,b,c}
     
     o2 = a <0> + b <1> + c <2>
     
           3
     o2 : R
     
     i3 = v_1
     
     o3 = b
     
     o3 : R

See also _.

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