multivalued function
binary relation, which is left-total, but may not be right-unique ; isomorph to another function from the same source set, but to the power set of the codomain of the initial function
logarithm
inverse of the exponential function, which maps products to sums
function
association of a single output to each input
argument
property of a complex number; angle between the positive real axis and the line joining the origin and the number; function that "extracts" the angle from a complex number
square root
inverse operation of square for finding the original base number