(mathematics) A modification of the harmonic series, formed by omitting all terms whose denominator expressed in base 10 contains the digit 9.

(mathematics, mathematical analysis) Any series resulting from the decomposition of a periodic function into terms involving cosines and sines (or, equivalently, complex exponentials).

(physics) The set of spectral lines of the hydrogen atom that correspond to transitions involving a principal quantum number n=2

A list of metals and alloys arranged according to their relative electrolytic potentials in a given environment.

plural of series circuit

Alternative form of television series / plural of TV series

(mathematics) A type of formal infinite series, a generalization of Puiseux series. They allow for arbitrary exponents of the indeterminate so long as the set supporting them forms a well-ordered subset of the value group.

A model for nonlinear behavior similar to the Taylor series, differing in its ability to capture 'memory' effects.

(mathematics, mathematical analysis) Any infinite series of the general form ∑ᵢ₌₀ ᪲a_i(x-c)ⁱ.

(mathematics) The divergent infinite series ∑ₙ₌₀ ᪲(-1)ⁿ=1-1+1-1+⋯.