For example, −2 has a real 5th root, − 2 5 = − 1.148698354 … {\displaystyle {\sqrt{-2}}=-1.148698354\ldots } but −2 does not have any real 6th roots.
Ví dụ, -2 có căn bậc 5, − 2 5 = − 1.148698354 … {\displaystyle {\sqrt{-2}}\,=-1.148698354\ldots } nhưng -2 không có căn bậc sáu thực.