purely imaginary
(complex analysis) Of a number, having real part equal to zero.
(informal, chemistry) Any chemical process or technique that is relatively low-tech, and does not require specialist equipment or skills, or precise measurement or control.
(transitive) To farm too much.
The fear or dread of outer space.
その行列は実部がゼロの固有値を持つため、系は増幅したり減衰したりせずに振動します。
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