This isn't bad. I'm surprised it's expensive now.

https://www.amazon.com/No-bullshit-guide-math-physics/dp/099...

From the fist paper: If you want to learn more university-level math and physics, I invite you to check out my book, the No bullshit guide to math and physics

I just wanted to pop in and say this book has been excellent. These papers are brief and therefore a bit cryptic, but the book is eminently readable. https://www.amazon.com/No-bullshit-guide-math-physics/dp/099...