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In page Atomic orbital:

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In all these cases we generate a Cartesian label for the orbital by examining, and abbreviating, the polynomial in x, y, z appearing in the numerator. We ignore any terms in the z, r polynomial except for the term with the highest exponent in z. We then use the abbreviated polynomial as a subscript label for the atomic state, using the same nomenclature as above to indicate the n {\displaystyle n} and {\displaystyle \ell } quantum numbers.[citation needed]