Looking to attain fluency in mathematics, not academic mastery

I'm a business/international relations person and a lot of my job is flying around. I have had a lot of downtime recently, and couldn't find a sustainable hobby to fill in that time.

Until I found Michael Spivak's Calculus and decided that it was legitimately a very fun book to read. I didn't actually do the problem sets, but I read the book carefully, and can say that while I by no means mastered the material, I'm generally conversant in it. I might actually end up doing the problem sets at some point, but that's another thing...

In a similar vein to my previous endeavors, becoming "fluent" in undergraduate biology and philosophy through self-study during my downtime, I'd like to do the same thing with mathematics and statistics.

Can someone help me plan out and structure what books I should read and in what order? Let's try to avoid popular science books. I liked the level of technicality in Spivak's book. Again, I'm not trying to reach any sort of academic mastery, just technical "conversational" fluency.

There are plenty of "what should I read" questions around, but I think mine is slightly different, by virtue of asking for a structure, and specifying what I want to achieve. Also, I like the proof-based approach used by Spivak, and would like to see something similar for statistics.

edit

To clarify, when I read Spivak's book Calculus, I didn't skip the dense parts. I read and understood the proofs. Whether I could replicate them on my own is another issue--I attribute this to the lack of problem sets completed--but I enjoyed the dense parts of Spivak's books. So, I am absolutely looking for something more technical than A Brief History of Time, etc, etc.

Solution 1:

Given what you've said, I recommend looking at the following.

1. The MAA's New Mathematical Library books

2. Mathematics: Its Content, Methods and Meaning

Note that #2 above, a well known English translation that first appeared in 1965 (the date of the 3-volume hardback edition I have), is now available as a relatively cheap Dover paperback. Incidentally, all 12 of the present amazon.com reviews give this book a 5-star rating (the maximum).

3. English translations of the Russian Popular Lectures in Mathematics Series. Besides the google search I embedded in the previous sentence, see also David Singmaster's list.

Solution 2:

When I first came into possession of "Fearless Symmetry" by Avner Ash and Robert Gross, I had no idea who the target audience was. On the one hand, this book is very far from being a textbook; it is not adequate reading for a mathematician seeking technical expertise in the area of Galois representations. On the other hand, it is certainly not a "popular science" book. When I initially heard about this book, I had hopes of sharing it with family members who wondered what I studied. Once I flipped through it, such hopes were dashed. Surely, no ordinary lay reader would want to read this book.

Judging from your question, it seems like you may actually be the target audience.

This book attempts to build up an explanation of what Galois representations are for those people who haven't seen math since high school or their first year of college. This is a Herculean task, and the reviews on Amazon suggest that the authors probably did not totally succeed, but they also didn't totally fail.

You mentioned that you like to do problems sparingly; you'll be happy to know, then, that problems are sprinkled sparingly throughout the book to help you judge whether you're keeping up.

This book will give you a whirlwind introduction to many aspects of modern algebra. By the end, you will have glimpsed the cutting edge.

If you decide to read this book, please check back and let me know what you thought of it!