Subtraction

• The well-known rule that subtraction is equivalent to addition of a negated operand is important in computing

  a - b ? a + (-b)
  

• In the arithmetic-logic unit of a computer, there is no subtraction circuitry per se, just negation

010 . . . 0

110 . . . 1

000 . . . 1

+

a

b

1

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