Natural - present in or in conformity with character or even the observable earth; neither supernatural nor magical; "a perfectly natural rationalization" There are 2 standard approaches for formally defining natural numbers. The 1st a single is called Peano arithmetic and consists of an autonomous axiomatic idea based upon a https://shanexwuro.blogolize.com/the-definitive-guide-to-nighttime-calming-for-dogs-76779140