\title{\bf Announcement 471: The 5th birthday of the division by zero $z/0=0$ \\ (2019.2.2)} \author{{\it Institute of Reproducing Kernels}\\

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\title{\bf  Announcement 471:  The 5th birthday of the division by zero $z/0=0$ \\

(2019.2.2)}

\author{{\it Institute of Reproducing Kernels}\\

Kawauchi-cho, 5-1648-16,\\

Kiryu 376-0041, Japan\\

{\bf kbdmm360@yahoo.co.jp}\\

 }

\date{\today}

\maketitle

 The Institute of Reproducing Kernels is dealing with the theory of division by zero calculus and declares that the division by zero was discovered as $0/0=1/0=z/0=0$ in a natural sense on 2014.2.2. The result shows a new basic idea on the universe and space since Aristotelēs (BC384 - BC322) and Euclid (BC 3 Century - ), and the division by zero is since Brahmagupta  (598 - 668 ?).

 For the details, see the references and the site: http://okmr.yamatoblog.net/

We wrote a global book manuscript \cite{s18} with 227 pages

 and stated in the preface and last section of the manuscript as follows:

\bigskip

{\bf Preface}

\medskip

 The division by zero has the long and mysterious history over the world (see, for example, \index{H. G. Romig} \cite{boyer, romig} and Google site with the division by zero) with its physical viewpoint since the document of zero in India in AD 628. In particular, note that \index{Brahmagupta}  Brāhmasphuṭasiddhānta (598 -668 ?) established  four arithmetic operations by introducing $0$ and at the same time he defined as $0/0=0$ in

 Brāhmasphuṭasiddhānta. We have been, however, considering that his definition $0/0=0$ is wrong over 1300 years, but, we will see that his definition is right and suitable.

 The division by zero $1/0=0/0=z/0$ itself will be quite clear and trivial with several natural extensions of  fractions against the mysteriously long history, as we can see from the concept of  the Moore-Penrose generalized inverse \index{Moore-Penrose}  \index{Tikhonov regularization} to the fundamental equation $az=b$, whose solution leads to the definition of  $z =b/a$.

  However, the result (definition) will show that

      for the elementary mapping

$$

W = \frac{1}{z},

$$

the image of $z=0$ is $W=0$ ({\bf should be defined from the form}). This fact seems to be a curious one in connection with our well-established popular image for the  point at infinity on the Riemann sphere \index{Riemann sphere} (\cite{ahlfors}).  As the representation of the \index{point at infinity} point at infinity of the \index{Riemann sphere} Riemann sphere by the

zero $z =  0$, we will see some delicate relations between $0$ and $\infty$ which show a strong \index{discontinuity}

discontinuity at the point of infinity on the Riemann sphere. We did not consider any value of the elementary function $W =1/ z $ at the origin $z = 0$, because we did not consider the division by zero

$1/ 0$ in a good way. Many and many people consider its value by  limiting like $+\infty $ and  $- \infty$ or the

point at infinity as $\infty$. However, their basic idea comes from {\bf continuity} with the common sense or

based on the basic idea of  Aristotelēs %Aristotle\index{Aristotle}.

 --

 For the related Greek philosophy, see \cite{a,b,c}. However, as the division by zero we will consider the value of

the function $W =1 /z$ as zero at $z = 0$. We will see that this new definition is valid widely in

mathematics and mathematical sciences, see  (\cite{mos,osm}) for example. Therefore, the division by zero will give great impacts to calculus, Euclidean geometry, analytic geometry, differential equations,  complex analysis at the undergraduate level and to our basic idea for the space and universe.

We have to arrange globally our modern mathematics at our undergraduate level. Our common sense on the division by zero will be wrong, with our basic idea on the space and universe since  Aristotelēs  and Euclid. We would like to show clearly these facts in this book. The content is at the undergraduate level.

Close the mysterious and long history of division by zero that may be considered as a symbol of the stupidity of the human race and open the new world since Aristotel{$\bar{\rm e}$}s-Eulcid.

\bigskip

\bigskip

{\bf Conclusion}

\medskip

 Apparently, the common sense on the division by zero with a long and mysterious history is wrong and our basic idea on the space around the point at infinity is also wrong since Euclid. On the gradient or on derivatives we have a great missing since $\tan (\pi/2) = 0$. Our mathematics is also wrong in elementary mathematics on the division by zero.

This book is  elementary on our division by zero as the first publication of  books for the topics. The contents  have wide connections to various fields beyond mathematics. The author expects the readers to write some philosophy, papers and essays on the division by zero from this simple source book.

The division by zero theory may be developed and expanded greatly as in the author's conjecture whose break theory was recently given surprisingly and deeply by  Professor \index{Qi'an Guan}Qi'an Guan \cite{guan} since 30 years proposed  in \cite{s88} (the original is in \cite {s79}).

We have to arrange globally our modern mathematics with our division by zero  in our undergraduate level.

We have to change our basic ideas for our space and world.

We have to change globally our textbooks and scientific books on the division by zero.

\bigskip

Our division by zero research group wonders why our elementary results may still not be accepted by some wide world.

 \medskip

%We hope that:

%close the mysterious and long history of division by zero that may be considered as a symbol of the stupidity of the human race and open the new world since Aristotle-Eulcid.

% \medskip

From the funny history of the division by zero, we will be able to realize that

\medskip

 human beings are full of prejudice and prejudice, and are narrow-minded, essentially.

\medskip

It seems that the long history of the division by zero is our shame and our mathematics in the elementary level has basic missings. Meanwhile, we have still  great confusions and wrong ideas on the division by zero. Therefore, we would like to ask for the good corrections for the wrong ideas and some official approval for our division by zero as our basic duties.

\bibliographystyle{plain}

\begin{thebibliography}{10}

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L. V. Ahlfors, Complex Analysis, McGraw-Hill Book Company, 1966.

 \bibitem{boyer}

C. B. Boyer, An early reference to division by zero,  The Journal of the American Mathematical Monthly, {\bf 50} (1943), (8), 487- 491. Retrieved March 6, 2018, from the JSTOR database.

\bibitem{cs}

L. P.  Castro and S. Saitoh,  Fractional functions and their representations,  Complex Anal. Oper. Theory {\bf7} (2013), no. 4, 1049-1063.

\bibitem{dops}

W. W. D\"aumler, H. Okumura,  V. V.  Puha and  S. Saitoh,

 Horn Torus Models for the Riemann Sphere and Division by Zero.   (manuscript).

\bibitem{guan}

Q.  Guan,  A proof of Saitoh's conjecture for conjugate Hardy H2 kernels, arXiv:1712.04207.

\bibitem{kmsy}

M. Kuroda, H. Michiwaki, S. Saitoh, and M. Yamane,

New meanings of the division by zero and interpretations on $100/0=0$ and on $0/0=0$,

Int. J. Appl. Math.  {\bf 27} (2014), no 2, pp. 191-198,  DOI: 10.12732/ijam.v27i2.9.

\bibitem{ms16}

T. Matsuura and S. Saitoh,

Matrices and division by zero $z/0=0$,

Advances in Linear Algebra \& Matrix Theory, {\bf 6}(2016), 51-58

Published Online June 2016 in SciRes.   http://www.scirp.org/journal/alamt

\\ http://dx.doi.org/10.4236/alamt.2016.62007.

\bibitem{mms18}

T. Matsuura, H. Michiwaki and S. Saitoh,

$\log 0= \log \infty =0$ and applications. Differential and Difference Equations with Applications. Springer Proceedings in Mathematics \& Statistics. {\bf 230}  (2018), 293-305.

\bibitem{msy}

H. Michiwaki, S. Saitoh and  M.Yamada,

Reality of the division by zero $z/0=0$.  IJAPM  International J. of Applied Physics and Math. {\bf 6}(2015), 1--8. http://www.ijapm.org/show-63-504-1.html

\bibitem{mos}

H. Michiwaki, H. Okumura and S. Saitoh,

 Division by Zero $z/0 = 0$ in Euclidean Spaces,

 International Journal of Mathematics and Computation, {\bf 2}8(2017); Issue  1, 1-16.

\bibitem{osm}

H. Okumura, S. Saitoh and T. Matsuura, Relations of   $0$ and  $\infty$,

Journal of Technology and Social Science (JTSS), {\bf 1}(2017),  70-77.

\bibitem{os}

H. Okumura and S. Saitoh, The Descartes circles theorem and division by zero calculus. https://arxiv.org/abs/1711.04961 (2017.11.14).

\bibitem{o}

H. Okumura, Wasan geometry with the division by 0. https://arxiv.org/abs/1711.06947 International  Journal of Geometry. {\bf 7}(2018), No. 1, 17-20.

\bibitem{os18april}

H.  Okumura and S. Saitoh,

Harmonic Mean and Division by Zero,

Dedicated to Professor Josip Pe\v{c}ari\'{c} on the occasion of his 70th birthday,　Forum Geometricorum,　{\bf 18} (2018), 155—159.

\bibitem{os18}

H. Okumura and S. Saitoh,

Remarks for The Twin Circles of Archimedes in a Skewed Arbelos by H. Okumura and M. Watanabe, Forum Geometricorum, {\bf 18}(2018), 97-100.

\bibitem{os18e}

H. Okumura and S. Saitoh,

Applications of the division by zero calculus to Wasan geometry.

GLOBAL JOURNAL OF ADVANCED RESEARCH ON CLASSICAL AND MODERN GEOMETRIES” (GJARCMG),  {\bf 7}(2018), 2, 44--49.

\bibitem{os1811}

H. Okumura and S. Saitoh,

Wasan Geometry and Division by Zero Calculus,

Sangaku Journal of Mathematics (SJM), {\bf  2 }(2018),  57--73.

\bibitem{ps18}

S. Pinelas and S. Saitoh,

Division by zero calculus and differential equations. Differential and Difference Equations with Applications. Springer Proceedings in Mathematics \& Statistics. {\bf 230}  (2018), 399-418.

\bibitem{romig}

H. G. Romig, Discussions: Early History of Division by Zero,

American Mathematical Monthly, {\bf 3}1, No. 8. (Oct., 1924),  387-389.

\bibitem{s79}

S. Saitoh, The Bergman norm and the Szeg\"{o} norm, Trans. Amer. Math. Soc., {\bf 249} (1979), no. 2, 261-279.

\bibitem{s88}

 S. Saitoh, Theory of reproducing kernels and its applications. Pitman Research Notes in Mathematics Series, {\bf 189}. Longman Scientific \&Technical, Harlow; copublished in the United States with John Wiley \& Sons, Inc., New York, (1988). x+157 pp. ISBN: 0-582-03564-3.

\bibitem{s14}

S. Saitoh, Generalized inversions of Hadamard and tensor products for matrices,  Advances in Linear Algebra \& Matrix Theory.  {\bf 4}  (2014), no. 2,  87--95. http://www.scirp.org/journal/ALAMT/

\bibitem{s16}

S. Saitoh, A reproducing kernel theory with some general applications,

Qian,T./Rodino,L.(eds.): Mathematical Analysis, Probability and Applications - Plenary Lectures: Isaac 2015, Macau, China, Springer Proceedings in Mathematics and Statistics,  {\bf 177}(2016),     151-182.

\bibitem{s17}

S. Saitoh, Mysterious Properties of the Point at Infinity, arXiv:1712.09467 [math.GM](2017.12.17).

\bibitem{s18}

S. Saitoh, Division by zero calculus (235 pages): http//okmr.yamatoblog.net/

\bibitem{ttk}

S.-E. Takahasi, M. Tsukada and Y. Kobayashi,  Classification of continuous fractional binary operations on the real and complex fields,  Tokyo Journal of Mathematics,   {\bf 38}(2015), no. 2, 369-380.

\bibitem{a}

https://philosophy.kent.edu/OPA2/sites/default/files/012001.pdf

\bibitem{b}

http://publish.uwo.ca/~jbell/The 20Continuous.pdf

\bibitem{c}

http://www.mathpages.com/home/kmath526/kmath526.htm

\bibitem{ann179}

Announcement 179 (2014.8.30): Division by zero is clear as z/0=0 and it is fundamental in mathematics.

\bibitem{ann185}

Announcement 185 (2014.10.22): The importance of the division by zero $z/0=0$.

\bibitem{ann237}

Announcement 237 (2015.6.18):  A reality of the division by zero $z/0=0$ by  geometrical optics.

\bibitem{ann246}

Announcement 246 (2015.9.17): An interpretation of the division by zero $1/0=0$ by the gradients of lines.

\bibitem{ann247}

Announcement 247 (2015.9.22): The gradient of y-axis is zero and $\tan (\pi/2) =0$ by the division by zero $1/0=0$.

\bibitem{ann250}

Announcement 250 (2015.10.20): What are numbers? -  the Yamada field containing the division by zero $z/0=0$.

\bibitem{ann252}

Announcement 252 (2015.11.1): Circles and

curvature - an interpretation by Mr.

Hiroshi Michiwaki of the division by

zero $r/0 = 0$.

\bibitem{ann281}

Announcement 281 (2016.2.1): The importance of the division by zero $z/0=0$.

\bibitem{ann282}

Announcement 282 (2016.2.2): The Division by Zero $z/0=0$ on the Second Birthday.

\bibitem{ann293}

Announcement 293 (2016.3.27):  Parallel lines on the Euclidean plane from the viewpoint of division by zero 1/0=0.

\bibitem{ann300}

Announcement 300 (2016.05.22): New challenges on the division by zero z/0=0.

\bibitem{ann326}

 Announcement 326 (2016.10.17): The division by zero z/0=0 - its impact to human beings through education and research.

 \bibitem{ann352}

Announcement 352(2017.2.2):   On the third birthday of the division by zero z/0=0.

\bibitem{ann354}

Announcement 354(2017.2.8):　What are $n = 2,1,0$ regular polygons inscribed in a disc? -- relations of $0$ and infinity.

\bibitem{362}

Announcement 362(2017.5.5): Discovery of the division by zero as  $0/0=1/0=z/0=0$

 \bibitem{380}

Announcement 380 (2017.8.21):  What is the zero?

\bibitem{388}

Announcement 388(2017.10.29):   Information and ideas on zero and division by zero (a project).

 \bibitem{409}

Announcement 409 (2018.1.29.): 　Various Publication Projects on the Division by Zero.

\bibitem{410}

Announcement 410 (2018.1 30.):  What is mathematics? -- beyond logic; for great challengers on the division by zero.

 \bibitem{412}

Announcement 412(2018.2.2.): The 4th birthday of the division by zero $z/0=0$.

\bibitem{433}

Announcement 433(2018.7.16.):  Puha's Horn Torus Model for the Riemann Sphere From the Viewpoint of Division by Zero.

\bibitem{448}

Announcement 448(2018.8.20):  Division by Zero;

 Funny History and New World.

\bibitem{454}

Announcement 454(2018.9.29): The International Conference on Applied Physics and Mathematics, Tokyo, Japan, October 22-23.

\bibitem{460}

Announcement 460(2018.11.06): Change the Poor Idea to the Definite Results For the Division by Zero - For the Leading Mathematicians.

\bibitem{461}

Announcement 461(2018.11.10): An essence of division by zero and a new axiom.

\end{thebibliography}

\end{document}

 2019.1.23.6:50 fine

2019.1.24.6:06  fine

2019.1.25.6:21

2019.1.27.6:34 snow morning

2019.1.31.5:48

2019.2.1.13:55