A formula used in atomic physics to describe the wavelengths of spectral lines of many chemical elements.

(physics) An equation used to calculate the flow velocity of a fluid in an open-channel system, relating Chezy's coefficient to variables such as radius, roughness, and discharge.

(religion, Christianity) The phrase "in the name of the Father, and of the Son, and of the Holy Spirit", or words to that form and effect, referring to the three persons of the Christian Trinity.

Alternative letter-case form of trinitarian formula

(graph theory) A formula for the number of spanning trees of a complete graph of n vertices: nⁿ⁻².

An empirical formula estimating the average velocity of a liquid flowing in a conduit that does not completely enclose the liquid, i.e. an open channel.

Alternative form of Kekulé formula

Two related iterative methods used in geodesy to calculate the distance between two points on the surface of a spheroid.

(fluid dynamics) A formula that describes the mean flow velocity of steady, turbulent open-channel flow.

(mathematics) An equality involving Fourier coefficients of automorphic forms, with the coefficients twisted by additive characters on either side. It can be regarded as a Poisson summation formula for non-abelian groups.