Thực đơn
Hàm_hằngThực đơn
Hàm_hằngLiên quan
Hàm hằng Hàm Hưng Hàm ThắngTài liệu tham khảo
WikiPedia: Hàm_hằng http://mathworld.wolfram.com/.html http://web.cortland.edu/matresearch/OxfordDictiona... http://planetmath.org/?op=getobj&from=objects&id=4... https://archive.org/details/encyclopediamath00tant... https://archive.org/details/encyclopediamath00tant... https://commons.wikimedia.org/wiki/Category:H%C3%A...