A function named for this letter is conjectured to have nontrivial zeros only when the real part of its input is one-half; that function simplifies to the harmonic series for an input of one.
In the atmospheric sciences, this letter is used to represent the vertical component of relative vorticity. The electrical double layer repulsive force is proportional to the square of a term named for this letter. A quantity represented by this letter is equal to one-half the quality factor; that quantity is the damping ratio. That aforementioned term is the potential at the surface of hydrodynamic shear for a particle in a colloid. A function named for this letter is conjectured to have nontrivial zeros only when the real part of its input is one-half; that function simplifies to the harmonic series for an input of one. For 10 points, identify this Greek letter that names a function studied by Riemann.
In the atmospheric sciences, this letter is used to represent the vertical component of relative vorticity.
zeta