公设

公设	gōng shè	(math.) postulate / public facilities (abbr. for 公共设施)
公	gōng	public / collectively owned / common / international (e.g. high seas, metric system, calendar) / make public / fair / just / Duke, highest of five orders of nobility 五等爵位 / honorable (gentlemen) / father-in-law / male (animal)
设	shè	to set up; to put in place / (math.) given; suppose; if