Math Ban _Page 6
Mysterious Triangle Meeting_Page 14
The Story of Archimedes, the Pulley Prince _Page 22
Marriage or Math _ Page 34
Archimedes' Parchment_Page 44
The Lost Sophie_Page 56
The Black Bread Man's Secret _ Page 70
All the Shapes of the World _Page 78
The Mushroom Hunter, Perelman's Story _Page 86
The Law of Universal Solitude _Page 94
The Ghost Student, Sophie Germain's Story_Page 108
Infinite Greetings_Page 120
Introducing Three Mathematicians _Page 130

Why do you like math so much?
The answers lie in the lives of Archimedes, Perelman, and Sophie Germain!

Many people think that mathematics is difficult and only a few people like it.
The term 'math dropout' is commonly used to refer to someone who has given up on math, and in reality, there are only a handful of students in a class who like math.
But the main character of this book, Sophie, loves math so much.
Every night, her mom and dad block Sophie's math studies by turning off the candles and the stove, and even locking the closet door to prevent her from going inside to study to avoid the cold. But Sophie wraps her frozen body in a blanket and studies math.


How can I do this in an age where women are not required to study math, nor are they forced to, and are told not to study math?
If you try to ignore it by thinking that it's only natural because he's the main character in a fairy tale, you're in big trouble.
This is because Sophie, Archimedes, and Perelman, who appear in "Sophie's Lost Math Lesson," are real people, and the book is based on their real lives.
Archimedes lost his life while solving mathematical problems even at the point of a Roman soldier's sword during a war, and modern mathematician Perelman succeeded in solving a difficult problem that had remained unsolved for over 300 years, but he continues his original research activities as a mathematician without being obsessed with wealth and fame.
And the protagonist, Sophie Germain, is one of the few female mathematicians who made a significant mark in the history of mathematics.


What is it about mathematics that keeps them captivated, even in the face of life, fame, wealth, and national obstacles? "Sophie's Lost Math Lessons" hides the answer in the nightly conversations of three mathematicians who meet across time and space.


Life isn't a puzzle to be solved, it's a bundle of gifts.
Messages of encouragement and comfort from mathematicians who met through the "Law of Universal Solitude."
It's okay to be lonely! Because I have something I like!

"Sophie's Lost Math Lesson" is not a book that aims to explain difficult mathematical formulas in an easy-to-understand manner.
It's not a book that recommends that you like math because it's really fun.
This book is a fairy tale for everyone who loves something so much that they can get lost in it regardless of what others say, even if it's not about 'math'.


What if even my family didn't understand something I loved so much, and even prevented me from doing it? What if, like Sophie, I found myself in an environment where I absolutely couldn't pursue what I loved? Even if I had the skills, I couldn't get into the school I wanted because I was a woman. Even if I published a paper on mathematics or solved a difficult problem, I couldn't receive recognition for my contributions because I was a woman.
"Sophie's Lost Math Lesson" was born from the author's heart drawn to the 'loneliness' and 'solitude' that people in this situation would feel.
The three mathematicians featured in this book have achieved great achievements that will remain in the history of mathematics, but they also share the commonality of having spent lonely and solitary times in the world of mathematics.
The author uses the 'law of universal solitude', which states that lonely people are attracted to each other, to bring these three together across time and space, and to soothe and comfort their loneliness by having them engage in a pleasant conversation about mathematics.
And on the other hand, I pay tribute to those who have dedicated their lives to what they love, who have faced endless obstacles and sometimes even seemingly hopeless situations, and who have not given up.


Archimedes, who appears as the author's alter ego, says this at the end of the story.
“Life is not a homework assignment to be solved, but a bundle of gifts.”
Readers who join this secret gathering of genius mathematicians who transcend time and space will find what they love, follow their passion, live without loneliness, and experience the happiness of unwrapping a bundle of gifts every day.