思えば、我々は未だ微分係数、勾配、傾きの概念さえ、正しく理解されていないと言える。三角関数や2次曲線論でも理解は不完全で、無限の彼方の概念は、ユークリッド以来 捉えられていないと言える。 (2017.8.23.06:30 昨夜 風呂でそのような想いが、新鮮な感覚で湧いて来た。) The division by zero is uniquely and reasonably determined as 1/0=0/0=z/0=0 in the natural extensions of fractions. We have to change our basic ideas for our space and world Division by Zero z/0 = 0 in Euclidean Spaces Hiroshi Michiwaki, Hiroshi Okumura and Saburou Saitoh International Journal of Mathematics and Computation Vol. 28(2017); Issue 1, 2017), 1 -16. http://www.scirp.org/journal/alamt http://dx.doi.org/10.4236/alamt.2016.62007 http://www.ijapm.org/show-63-504-1.html
http://okmr.yamatoblog.net/…/announcement%20326-%20the%20di… http://okmr.yamatoblog.net/ Relations of 0 and infinity Hiroshi Okumura, Saburou Saitoh and Tsutomu Matsuura: http://www.e-jikei.org/…/Camera%20ready%20manuscript_JTSS_A… https://sites.google.com/site/sandrapinelas/icddea-2017