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In page Dimensional analysis:
"The dimensions that can be formed from a given collection of basic physical dimensions, such as T, L, and M, form an abelian group: The identity is written as 1;[citation needed] L0 = 1, and the inverse of L is 1/L or L−1. L raised to any integer power p is a member of the group, having an inverse of L−p or 1/Lp. The operation of the group is multiplication, having the usual rules for handling exponents (Ln × Lm = Ln+m). Physically, 1/L can be interpreted as reciprocal length, and 1/T as reciprocal time (see reciprocal second).
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