Perfect square

...A parent-child square is one in which the sum of the three outer middle squares and the opposing squares is the constant 26, as shown in Figure 1-b. A perfect square is one in which the pan-diagonals parallel to the diagonal (for example, 14 + 16 + 23 + 5 + 7) all have the constant 65, as shown in Figure 1-c. In addition to this, there are other properties such as mutual union, symmetrical four-sum, and Franklin type, as shown in the eight-square square. ...

*Some of the terminology explanations that refer to "perfect square" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…図1‐bのごとく外側の中3格が相対する格との和が定数26となるものを親子方陣という。図1‐cのごとく対角線に平行な汎対角線(例えば14＋16＋23＋5＋7)がすべて定数65となるものを完全方陣という。このほかに八方陣で示すように相結，対称四和，フランクリン型などの性質がある。…

※「完全方陣」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