{\textstyle h(D)\gg {\sqrt {|D|}}(\log |D|)^{-1}} (see Classnumberproblem(英语:Classnumberproblem) for comparison). This can be extended to an equivalence
Foundation. Gauss' ClassNumberProblem for Imaginary Quadratic Fields, by Dorian Goldfeld (页面存档备份,存于互联网档案馆): Detailed history of problem. Clark, Alex. 163
3矩陣與非負整數項能否組成一個自由半群。 決定兩個有限生成的Mn(Z)子半群是否有相同的元素。 Word problem for groups 共軛問題 群同構問題(Group isomorphism problem) 決定兩個有限單形(simplicial complex)是否表現同胚空間。 決定兩個有限單形(simplicial
amended till 2012 (PDF). [10 September 2012]. (原始内容 (PDF)存档于2013-12-03). Problem of plenty: As IITs multiply, the brand value diminishes. Hindustan Times