In telecommunication, a maritime broadcast communications net is a communications net[?] that is used for international distress calling, including international lifeboat, lifecraft, and survival-craft high-frequency (HF); aeronautical emergency very high-frequency[?] (VHF); survival ultra high-frequency[?] (UHF); international calling and safety very high-frequency (VHF); combined scene-of-search-and-rescue; and other similar and related purposes.
... third ideal such that A contains BC, then A contains C.
With this definition, two principal ideals (a) and (b) in the ring of integers Z are coprime if and only if a and ...