For any real number x, a function denoted by this letter equals the sum of the logarithms of all prime numbers less than x.
For any real number x, a function denoted by this letter equals the sum of the logarithms of all prime numbers less than x. This letter is used to write the first Chebyshev function, as well as a "homogeneity operator" in the theory of Bessel functions equal to z times the derivative with respect to z. Another function named for this letter solves the one-dimensional heat equation with periodic boundary conditions, and can be expressed as a product using the triple product identity. This (*) non-Roman letter identifies a class of quasiperiodic functions whose most common example is named for Jacobi, as well as a non-continuous function equal to the integral of the Dirac delta function. In addition to denoting the Heaviside step function, this letter is paired with phi to indicate the polar and azimuthal angles in spherical coordinates. For 10 points, identify this Greek letter usually used to denote an angle measure
For any real number x, a function denoted by this letter equals the sum of the logarithms of all prime numbers less than x.
theta