| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | complex number | mathematics enthusiasts | Widely used in mathematics and engineering for solving problems involving real and imaginary components. | 1 |
| 2 | imaginary number | mathematics culture | A complex number that can be written as a real number multiplied by the imaginary unit | 1 |
| 3 | square root of -1 (imaginary unit) | Mathematics | A fundamental part of complex numbers theory and used in many mathematical fields | 1 |