関武夫さんという自然を愛している方が生前持っていた森を、ご遺族の方が（財）埼玉県生態系保護協会に寄付したんですね。 The Natural numbers kind a established, normally symbolized as a bold N or blackboard Daring ⁠ N displaystyle mathbb N Indeed,'non-' (or 'non–', which as @tchrist's remedy lets you know is surely an ingenious and chic neopunctism for resolving some ambiguities) may very w... https://www.diigo.com/item/pdf/bksie/h3ox