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。 Intuitively, The natural quantity n is definitely the frequent assets of all sets that have n elements. So, It appears natural to outline n as an equivalence class under the relation "is usually built in one to 1 correspondence". Want to further improve this question? Gui... https://ayurvedicmedicineforlifestyledisorder.blogspot.com/