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Trey314159 (talk | contribs) m fix homoglyphs: convert Cyrillic characters in [С]ontinual to Latin |
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</math>
However, in most cases the functions ''f''(''x'') can be written in terms of an infinite series of [[orthogonal functions]] such as <math>f(x) = f_n H_n(x)</math>, and then the definition becomes
:<math>
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