Assertion: real number's root | /r/HasProperty | complex number
Facets:
Source sentences:
text: For example the square root of -1 is a complex number: ?
text: Only one of the roots is real, all the other six roots contain the symbol i, and are thus complex roots (more about those later on).
text: For example the square root of -4 is a complex number: PRINT SQRT(-4)