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Glossary

odd function a function f satisfying f (-x) = -f(x)

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one-one correspondence function from one set onto another which is
invertible, i.e. distinct elements of the domain have distinct images;
a pairing of elements of one set with those of another

open interval a set of reals of the form {t : a < t < b} denoted by (a, b)

open unit disc the set {% : ]z] < 1) in the complex plane

ordinate the second coordinate of a point in the Cartesian plane

over D with coefficients in D

parity the property of being even or odd

positive strictly greater than 0

pure imaginary a complex number equal to i times a nonzero real

sign the property of being positive, negative or zero

supplementary angles angles whose sum is 180’

surd conjugate of a + 4, a - fi

trivial inconsequential, nonessential, extremely straightforward (accord-

ing to context)

unique only one, exactly one

unit circle the circle in the complex plane with center 0 and radius 1, the

set {% : ]zj = 1)

unity one

upper bound of a set of numbers: a number not less than any number in

the set

vanishes equals zero

[CE] the greatest integer not exceeding z

* implies, is sufficient for

e is implied by, is necessary for

e if and only if, is logically equivalent to

N the set of natural numbers 1, 2, 3, 4,...

Z (“Zahlen”) the ring of integers