在数学中，Im指复数的虚部，与Re指代的实部共同组成一个复数。 如复数z=2+3i，则Im（z）=3，Re（z）=2。 在高等数学中，Im指“象”。

In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted i, called the imaginary unit and satisfying the equation ; every complex number can be expressed in the form , where a and b are real numbers.

2011年10月7日 · If a complex number $z$ is written as $z = a + bi$, then Re$(z) = a$ and Im$(z) = b$. (At risk of stating the obvious, "Re" stands for "Real" and "Im" stands for "Imaginary".) If we visualize complex numbers as vectors in $\mathbb{R}^2$, Re is the projection onto the real axis, and Im is onto the imaginary axis.

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2019年10月16日 · Is it possible to derive a formula for Re (z) or Im (z) that does not use Re (z) or Im (z) in the formula? If so, what is it? In other words, given any complex number z, where z = a+bi, and a and b are both real numbers, can we find a or b without using functions like Re (z), Im (z) or abs (z) (because abs (z) uses Re and Im in its definition)

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