Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.
The Mandelbrot graph is generated iteratively and so is a function of a function of a function ... and in that sense it is a composite function.
spherical bessel function arise in the solution of spherical schrodinger wave equation. in solving the problem of quantum mechanics involving spherical symmetry, like spherical potential well, the solution that is the wave function is spherical bessel function
Vasily Bessel was born in 1843.
Vasily Bessel died in 1907.
Bessel Kok was born in 1941.
Friedrich Bessel was born on July 22, 1784.
Friedrich Bessel was born on July 22, 1784.
Johann Franz Bessel was born in 1672.
Johann Franz Bessel died in 1749.
Friedrich Bessel died on March 17, 1846 at the age of 61.
Ehmi Bessel was born on October 11, 1904, in Ludwigshafen, Germany.
Friedrich Bessel died on March 17, 1846 at the age of 61.
Ehmi Bessel died on February 3, 1988, in Hamburg, West Germany.