The Riemann surface for the complex version of this is a helix-like plane spiraling around the z axis; in hyperbolic geometry, this function is in the distance formula for the geodesic between two points.
The Riemann surface for the complex version of this is a helix-like plane spiraling around the z axis; in hyperbolic geometry, this function is in the distance formula for the geodesic between two points. First defined to contain a "mantissa" by John Napier, this function is equal to the antiderivative of one over x. Increments on the slide rule increase according to this function using its product-to-sums property, and dividing one by another allows for a change of base. For 10 points, identify this function which, when found in base e form, is known as "natural," the inverse of the exponential function.
The Riemann surface for the complex version of this is a helix-like plane spiraling around the z axis; in hyperbolic geometry, this function is in the distance formula for the geodesic between two points.
natural logarithm [prompt "ln" or "lon"]