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单词 imaginary number
释义
imaginary number
Physics

  • A number that is a multiple of √−1, which is denoted by i; for example √−3=i√3. See also complex number.

Mathematics

  • A synonym for pure imaginary.

Science and Technology

  • A number that is the square root of a negative number, most commonly −1 designated i, for ‘imaginary’; i2 = –1. In this notation −81 = 9i. The natural logarithm (ln) of i: ln i = i π‎/2. The number is imaginary because any integer squared must yield a positive integer.

    Mike Allaby

Chemical Engineering

  • The part of a complex number that is a multiple of √−1, which is denoted as j. For example, −5=j5.

Electronics and Electrical Engineering

  • A number whose square is a negative real number. Imaginary numbers are written as the product of a real number coefficient r and the unit imaginary number i, where i2 = −1. This means that (ir)2 = −(r2). See also complex number.
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