 
 <prompt> Wetin be one important concept wey dem mention wey dey important to understand the passage? Based on di last question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: Mathematicians dey always try make dem classify complete complete any mathematical thing. For di mata of finite groups, dis aim dey lead to difficult mathematics. According to Lagrange's theorem, finite groups of order p, wey be prime number, must be cyclic (abelian) groups Zp. Groups of order p2 fit also show say dem be abelian, wey no dey apply to order p3, as di non-abelian group D4 of order 8 = 23 wey dey above don show. Computer algebra systems fit dey use to list small groups, but dem never classify all finite groups. Anoda step na di classification of finite simple groups. A group wey no be trivial group dey call simple if e normal subgroups na only di trivial group and di group itself. The Jordan-Hölder theorem dey show finite simple groups as di building blocks for all finite groups. To list all finite simple groups na big achievement for contemporary group theory. 1998 Fields Medal winner Richard Borcherds succeed for proving di monstrous moonshine conjectures, wey be surprising and deep relationship between di largest finite simple sporadic group - di "monster group" - and certain modular functions, wey be piece of classical complex analysis, and string theory, wey be theory wey suppose unify di description of many physical phenomena. 