Alternative form of lactoseries

(number theory) Any infinite series of the form ∑ₙ₌₁ ᪲(a_n)/(nˢ), where s and each a_n are complex numbers.

(electrical engineering) Of an electric motor, having the windings connected in series.

(marketing) A number of items, such as volumes of a publication, sold and delivered over a period of time.

A group of rootstocks for grafting apple trees.

(mathematics) An infinite series in the form of ∑ₙ₌₀ ᪲(-1)ⁿa_n or ∑ₙ₌₀ ᪲(-1)ⁿ⁺¹a_n, where a_n>0 for all n.

Alternative form of preseries.

One of the hydrogen spectral series, lying in the infrared band.

A hydrogen spectral series of transitions and resulting ultraviolet emission lines of the hydrogen atom as an electron goes from n ≥ 2 to n = 1 (where n is the principal quantum number), the lowest energy level of the electron.

One of the hydrogen spectral series.