Let the lowercase Latin indices a,b,c range from 1 to p (i.e., the tangential indices) and the Greek indices μ, γ range from p+1 to n (i.e., the normal indices).
Let the lowercase Latin subscripts a, b, c fall within the range of 1 to p (i.e., the tangential subscripts), and the Greek subscripts μ, γ fall within the range of p+1 to n (i.e., the normal subscripts).