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 Sets utilized to define natural numbers satisfy the Peano axioms. It follows that every theorem which can be said and proved in Peano arithmetic will also be proved in set principle. There are 2 standard approaches for formally defining natural figures. The first just... https://buyslimcenweightlosscapsules.blogspot.com