Parent and child square - Oyako Houjin

Japanese: 親子方陣 - おやこほうじん
Parent and child square - Oyako Houjin

...In the case of a pentagon, as shown in Figure 1-a, a symmetric square is one in which the sums of the two squares symmetrical to the central square 13 (for example, 17+9, 3+23) all add up to the constant 26. As shown in Figure 1-b, a parent-child square is one in which the sums of the three outer squares and the opposing squares add up to the constant 26. As shown in Figure 1-c, a perfect square is one in which the pandiagonals parallel to the diagonal (for example, 14+16+23+5+7) all add up to the constant 65. ...

*Some of the terminology that refers to "Parent-Child Square" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…五方陣でいえば図1‐aのごとく中心格13に関して対称な2格の和(例えば17+9,3+23)がすべて定数26となるものを対称方陣という。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。…

※「親子方陣」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

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