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Base Pair Frequency

The relative frequency of each nucleotide base (A, T, C, G) within a genome or a specific region of a genome, calculated as a proportion.
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The statement of the theorem

Let SS be a DNA sequence of total length L=∣S∣L = |S|. Let NX(S)N_X(S) be the count of nucleotide base X∈{A,T,C,G}X \in \{A, T, C, G\} within SS. The relative frequency fXf_X of base XX is defined as the proportion: fX=NX(S)Lf_X = \frac{N_X(S)}{L} \nSuch that ∑X∈{A,T,C,G}fX=1\sum_{X \in \{A, T, C, G\}} f_X = 1.