Topology, algebra, analysis—these were the relatively mainstream directions of research in the Myriad Dharma Sect today.
And these happened to be the foundations of the Bourbaki school.
When the mathematical pope Grothendieck first attended the Bourbaki school mathematics seminar organized by Cartan, the Bourbaki school's representative, after World War II, what they had discussed was simplicial Algebraic Topology, along with a bit of "new stuff" Cartan had devised himself—a brand-new concept that had not even appeared before the world, circulating only within that tiny mathematics seminar: "Layer Theory."
It was merely that this theory had already emerged after the war on Earth. And for some unknown reason, during this period, the further forward history went, the weaker the correspondence between the two worlds became. The Bourbaki school members who should already have appeared had no counterparts, while some early contributions that should originally have belonged to the Bourbaki school had instead been put forth by the Gottingen Sect. Moreover, because Gottingen Sect spells involved "infinite dimensions," this world's research into infinite-dimensional Lie groups—called "Limitless Groups" in this world—had begun far earlier than in Earth's corresponding history.
Under such circumstances, choosing "Layer Theory" as his first step into this field was exceedingly wise. The Cousin problem, the Levi problem, and so on were all achievements of the Gottingen Sect in this world. Layer Theory was only a minor branch among them. Yet its influence ran deep enough that it was well suited as a "beginning."
These past few days in Fusang, Wang Qi had intended to roughly establish the concept of Layer Theory.
For Wang Qi, this was not particularly difficult. Layer Theory was one of modern physics' commonly used tools. Anyone who had studied condensed matter physics basically had some impression of it. Here, he did not need some mature,