SL2(R) is a Subgroup of GL2(R)
ThegroupSL(2,-R)isdefinedasthegroupof2-times2matriceswithentriesfromthefieldofrealnumbersanddeterminant1 ...,由KCONRAD著作·被引用5次—universalcoveringspaceofSL2(R)istheinsideofasolidcylinderR×D(homeomorphictoR3).Thedegree-2coverofSL(2,R)isanimpor...。參考影片的文章的如下: