…The name fractal is related to the Hausdorff dimension, which F. Hausdorff and AS Besikovič discovered around 1919. If we explain only the self-similar figures mentioned above, the Hausdorff dimension is a different dimension that allows non-integer dimensions to be considered, unlike the usual topological dimensions of 0-dimensional points, 1-dimensional lines, 2-dimensional planes, and 3-dimensional solids. As mentioned earlier, line segments are self-similar, but rectangles and rectangular parallelepipeds are also self-similar figures, and if they are divided into N equal parts, the similarity ratio (part/whole) is 1/ N , 1/ N 1/2 , and 1/ N 1/3 . … *Some of the terminology references "Besikovič, AS" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…フラクタルという名は次に述べるハウスドルフ次元に関係してつけられている。すなわち,ハウスドルフF.HausdorffとベシコビッチA.S.Besikovičが1919年ころに発見したハウスドルフ次元というのは,上に述べた自己相似図形についてのみ説明してみれば,ふつうの次元,点は0次元,線は一次元,平面は二次元,立体は三次元というような位相的次元と異なって,非整数の次元も考えられるようにした別の次元なのである。先に線分は自己相似であるといったが,長方形も直方体も自己相似図形であって,それぞれN個の部分に等分すれば,相似比(部分/全体)は1/N,1/N1/2,1/N1/3である。… ※「Besikovič,A.S.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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