My name is Kexin Cheng. It's a little bit difficult to pronounce so you can also call me Hafnium Chen (from the meaning of my name's second Chinese character and the easy way of my family name) or Mikan Neko (nick name in Japanese)
Studying Mathematics in Tokyo University of Science, interested in math, physics, and any other interesting things
Barring unforeseen circumstances, I will be conducting undergraduate research under Associate Professor Daisuke Yamakawa
Practicing figure skating (recently suspended due to a fracture of my left greater trochanter)
Building and maintaining the school's figure skating club's website
Too many hobbies to say :3
My homepage is just a place where I put these resources so you can just read or download them freely if you like. This is the new version of my homepage so you can only find things which I wrote before. I don't mind if you spread or not, but I'm ashamed to see what I have written, so you just need to let me know which part you used when you use it on your work or lecture notes. You can find my contact information below. Thanks for your understanding :)
I put some notes and answers of lectures here. I can't put problems written by TA but I will write their name so if you are the same teacher/TA and they haven't changed the problems, you can find answers here
Also, I started to write my homework in LaTeX from the fall semester of grade 1, and started to write all my notes and homework and any other things in LaTeX from the spring semester of grade 2. Not only this, I used pdfLaTeX until the beginning of 2025 but I switched to xeLaTeX since then, so it's a little bit troublesome to convert these files to the new format, maybe I will do it one day and put them here
[Masanari Kida, Kyoichi Suzuki]
Algebra 1 Notes[Masanari Kida, Kyoichi Suzuki]
Algebra 2 Notes[Masahito Ohta, Yuki.Osada]
Analysis 1 Notes[Mieko Tanaka, Ryo Muramatsu]
Analysis 2 Notes[Daisuke Yamakawa, Tomoki Fujii]
Geometry 1 Notes[Daisuke Yamakawa, Tomoki Fujii]
Geometry 2 Notes[Yuusuke Sugiyama]
Statistics 2 NotesFor some reason, statistics 1 notes are not available and will not be uploaded in the foreseeable future
[Natsumi Oyamaguchi]
Topology NotesThis edu email is available until the beginning of 2029, and please change [at] into @