An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A branch of mathematics that deals usually with integers, rational numbers, real numbers, or complex numbers under addition, subtraction, multiplication, and division. See also → compute, → computation, → count, → calculate, → calculus, → mathematics, → statistics.

O.Fr. arsmetique, from M.L. arithmetica, from Gk. arithmetike (tekhne) "(art, skill) of numbers," from arithmos "number."

Hesâb, from Ar. hisab.

Of n numbers a₁, a₂, ..., a_n, the quantity defined as: (a₁ + a₂ + ... + a_n)/n.

→ arithmetic; → mean.

A → sequence of n numbers or quantities such that the difference between any two successive terms is a constant. In particular, if a is the first term, the nth term is a + (n - 1)d, where d is the constant. Also called → arithmetic sequence.

→ arithmetic; → progression.

→ arithmetic progression.

→ arithmetic; → sequence.

A system of calculation in which the only numerals used are 0 and 1. All the real numbers are represented in terms of powers of 2.

→ binary; → arithmetic.