When x² = −1, the number x (which is not a real number) is written as "sqrt(−1)" or "i", and is called the imaginary unit.
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When x² = −1, the number x (which is not a real number) is written as "sqrt(−1)" or "i", and is called the imaginary unit.
Source: tatoeba (11364669)
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.