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# Arithmetic and logic unit

arithmetic and logic unit
processor
(ALU or “mill”) The part of the central processing unit which performs operations such as addition, subtraction and multiplication of integers and bit-wise AND, OR, NOT, XOR and other Boolean operations. The CPU’s instruction decode logic determines which particular operation the ALU should perform, the source of the operands and the destination of the result.
The width in bits of the words which the ALU handles is usually the same as that quoted for the processor as a whole whereas its external busses may be narrower. Floating-point operations are usually done by a separate “floating-point unit”. Some processors use the ALU for address calculations (e.g. incrementing the program counter), others have separate logic for this.
(1995-03-24)

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• Arithmetic mean

the mean obtained by adding several quantities together and dividing the sum by the number of quantities: the arithmetic mean of 1, 5, 2, and 8 is 4. Historical Examples Then it will be sufficient to take the arithmetic mean of the two adjustments. The Foundations of Science: Science and Hypothesis, The Value of Science, […]

• Arithmetic progression

a sequence in which each term is obtained by the addition of a constant number to the preceding term, as 1, 4, 7, 10, 13, and 6, 1, −4, −9, −14. Historical Examples (b) Derive the formula for the sum of n terms of an arithmetic progression. A Review of Algebra Romeyn Henry Rivenburg noun […]

• Arithmetic-series

a sequence in which each term is obtained by the addition of a constant number to the preceding term, as 1, 4, 7, 10, 13, and 6, 1, −4, −9, −14. noun a sequence of numbers or quantities, each term of which differs from the succeeding term by a constant amount, such as 3,6,9,12 Compare […]

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