Envelope - Holakumen

Japanese: 包絡面 - ホウラクメン
Envelope - Holakumen
A surface that is tangent to all other surfaces and is the locus of tangent points. For example, the envelope of a group of spherical surfaces of radius a with their center on a line is a cylindrical surface of radius a .

Source: About Shogakukan Digital Daijisen Information | Legend

Japanese:
曲面群のすべてに接して、しかもその接点の軌跡となる曲面のこと。例えば、ある直線上に中心をもつ半径aの球面の曲面群からなる包絡面は、半径aの円柱面になる。

出典 小学館デジタル大辞泉について 情報 | 凡例

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