José Manuel Rodríguez Caballero Added an answer In the proof assistant Isabelle/HOL we have x/0 = 0 for each number x. This is advantageous in order to simplify the proofs. You can download this proof assistant here: https://isabelle.in.tum.de/ その後 我々が導いていた いろいろな公式について、できるかとの質問に対して 回答があり、 信じられないほどに ソフトが完成されていること(出力結果)を見て、驚嘆させられた。 Isabelle構築の責任者とは 相当以前から交流があったが、1/0=0 は convention で大したことではない と 言っていた。 ( - これはゼロ除算算法の著書素案に氏のメールを引用、責任者にも素案を送って確認している。) しかし、実は 相当なことを 大きな研究グループで ゼロ除算を発展させていた。 ここであるが物件で示せる事実は 次のようである: Dear Saitoh, In Isabelle/HOL, we can define and redefine every function in different ways. So, logarithm of zero depend upon our definition. The best definition is the one which simplify the proofs the most. According to the experts, z/0 = 0 is the best definition for division by zero.
\tan(\pi/2) = 0, $$ $$ \log 0 = $$ is undefined (but we can redefine it as $0$) $$ e^0 = 1, $$ (but we can redefine it as $0$) $$
$$ (but we can redefine it as $0$). In the attached file you will find some versions of logarithms and exponentials satisfying different properties. This file can be opened with the software Isabelle/HOL from this webpage: https://isabelle.in.tum.de/. Kind Regards, José M.
At 2019.3.4.18:04 for my short question, we received: It is as it was programmed by the HOL team. Jose M. On Mar 4, 2019, Saburou Saitoh wrote: Dear José M. I have the short question. For your outputs for the division by zero calculus, for the input, is it some direct or do you need some program??? With best regards, Sincerely yours, Saburou Saitoh 2019.3.4.18:00
下記は相対性の理論から0/0=1を永年主張されている方へのメールの一部で、公論の形をとっている:
2019.3.6.15:23: To accept that x/0 = 0 produces no contradiction, using the rules of Isabelle/HOL. You could download the software and try to prove that 1 = 0 (this will be impossible). http://isabelle.in.tum.de/ There are millions of dollars invested in Isabelle/HOL, where x/0 = 0 (this is not a joke): https://www.cl.cam.ac.uk/~lp15/Grants/Alexandria/ Prof. Saitoh derived that x/0 = 0 from pure geometric intuition and he was right.
2019.3.8.22:23: The deduction that z/0 = 0, for any z, is based in Saitoh's geometric intuition and it is currently applied in proof assistant technology, which are useful in industry and in the military.