`qqbar_is_root_of_unity`

Synopsis#include <flint/qqbar.h>

int qqbar_is_root_of_unity(slong * p, ulong * q, const qqbar_t x)source

Returns whether x is a root of unity, that is, whether its minimal polynomial is cyclotomic. If so and if p and q are not NULL, sets them to the integers with $0 \le p < q$ and $\gcd(p, q) = 1$ such that $x = e^{2 \pi i p / q}$ .

Cite this page

The FLINT team, “qqbar_is_root_of_unity (qqbar.h),” FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev, 2026. https://flintlib.org/doc/qqbar/qqbar_is_root_of_unity.html (generated 2026-11-02).

@misc{flint-doc-qqbar-qqbar-is-root-of-unity,
  author       = {{The FLINT team}},
  title        = {{qqbar\_is\_root\_of\_unity (qqbar.h)}},
  howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
  year         = {2026},
  url          = {https://flintlib.org/doc/qqbar/qqbar_is_root_of_unity.html},
  note         = {Generated 2026-11-02}
}

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