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In mathematics, a fibrifold is (roughly) a fiber space whose fibers and base spaces are orbifolds. They were introduced by , who introduced a system of notation for 3-dimensional fibrifolds and used this to assign names to the 219 affine space group types. 184 of these are considered reducible, and 35 irreducible. == Irreducible cubic space groups == The 35 irreducible space groups correspond to the cubic space group. Irreducible group symbols (indexed 195−230) in Hermann–Mauguin notation, Fibrifold notation, geometric notation, and Coxeter notation: +">) || || colspan=4| |- align=center !rowspan=5|Hexoctahedral mm ( *432) !221||222||223||224||225||226||227||228||229||230 |- BGCOLOR="#ffe0e0" align=center | Pmm || Pnn || Pmn || Pnm || Fmm || Fmc || Fdm || Fdc || Imm || Iad |- BGCOLOR="#e0e0ff" align=center ||4−:2||8oo||8o ||4+:2||2−:2||4−− ||2+:2||4++ ||8o:2||8o/4 |- BGCOLOR="#ffffd0" align=center || P43 || Pn4n3n || P4n3n || Pn43 || F43 || F4c3a || Fd4n3 || Fd4c3a || I43 || Ib4d3d |- BGCOLOR="#e0ffe0" align=center ||()|| || ||] ||() ||() ||] ||] || |} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fibrifold」の詳細全文を読む スポンサード リンク
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