Complex-number meaning

kŏmplĕks
Any number of the form a + bi, where a and b are real numbers and i is an imaginary number whose square equals −1.
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Any number expressed as a + bi, where a and b are real numbers and i is the imaginary unit, −1: if b is zero the expression is a real number, but if b is not zero the expression is an imaginary number.
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A number that can be expressed in terms of i (the square root of −1). Mathematically, such a number can be written a + bi, where a and b are real numbers. An example is 4 + 5 i.
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(complex analysis) A number of the form a + bi, where a and b are real numbers and i denotes the imaginary unit.
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