SmallRedBird wrote: ↑Sun Mar 08, 2020 7:28 pm

Because everyone, including myself, is too scared to be anything less than prepared-for-anything for every topic regularly covered. But I sort of like this way of grinding tedious problems for sake of improving computational efficiency, especially for calculus/diff eq. I've heard the rumor of the test getting noticeably "more difficult" since the last publicly released practice test, so hopefully, it's not all as ridiculous as it seems.

I took it in April 2019, so I believe I have a fairly up-to-date sense of what it's like.

mani_fold wrote: ↑Sat Mar 07, 2020 6:14 pm

**Calculus & ODEs** Stewart is a good resource. Key sections are 7.5 and 11.7; make sure to do all of the problems in those sections once or twice. For ODEs, I like

*Schaum's Outline of Differential Equations* by Bronson since it condenses the material and has a ton of problems.

Sure there are a lot of calculus problems, so it makes sense to practice them. But for ODEs there are like three things you need to know how to do. Separate and integrate, second order factorize a quadratic, and multiply by $$e^x$$ sometimes. You don't need to go overboard.

[*] **Analysis** *A Problem Book in Analysis*, Aksoy & Khamsi; *Understaning Analysis*, Abbot.

I don't know these books, but you only need to know the most basic principles of analysis, eg what a limit is.

[*] **Algebra** Easy problems in *A First Course in Abstract Algebra* by Fraleigh. Harder problems in *Abstract algebra*, Dummit \& Foote. For linear algebra, study *Linear Algebra: Challenging Problems for Students* by Zhang.

You definitely don't need Dummit and Foote. All you need is the definition of a group and a ring. If you know those definitions and are able to play around with inverses and maybe know the FT on finite abelian groups that's enough. Linear algebra I don't remember seeing anything more advanced than knowing what the rank of a map is, or basic properties like multiplicativity of determinants.

[*] **Combinatorics** Two types of combo should be studied. First is enumerative combinatorics; see the associated chapter in *Problem Solving Strategies* by Engel. The other type is graph theory, see *Graph theory: a problem oriented approach* by Marcus (great book).

Sure some of Engel is really easy but most of it is way too hard. The combinatorics in the GRE is stuff you'll find in a 4th grade math competition. Try practicing those, or some MathCounts (a middle school competition) if you want to overachieve. I don't know of any graph theory on the GRE at all but if there is any it is surely not above the middle school level.

[*] **Probability** For a gentle introduction, see *A first course in probability* by Ross. Some good problems, especially at the beginning over counting/discrete probability.

I don't know this book, but again it will more than suffice to look over some middle school competition problems for counting and probability.

[*] **Geometry & Topology** For Topology, I like *Elementary Topology Problem Book* by Viro, Ivanov, et al.. For geometry, I like *Euclidean Geometry in the Mathematical Olympiads* by Chen (IMO god). Be warned: those problems are hard as ____, but a few hours spent in the first part attempting them pays off.

I don't know the topology book, but I'm sure that you can get away with only knowing the definition of open sets, closed sets, and a topology on the GRE. Evan Chen's book is completely, completely irrelevant and overkill for the GRE. Like, seriously.

[*] **Number Theory** The number theory section of *Problem Solving Strategie*s by Engel is a great resource. Very accessible and challenging. Also there's an old one by Minkowski(?) that I don't remember the title of.

I don't really think there is any number theory on the GRE. Maybe you need to know how to find the sum of the factors of an integer or something or how to take mods, but I don't think there's any theory needed. Much of Engel is way too hard.

[*] **Statistics** Don't rule out a random stats question on this exam, but again, don't try to master something new; some good general stuff can be found in *Schaum's Outline of Statistics* by Spiegel.

Why would you read a stats book? Maybe you need to remember the definition of median. You don't need anything not taught in elementary school.

These are probably good books in general but they aren't really geared for the GRE. I think practicing things like the AMC 10 (a high school contest under similar time restrictions) will be better for improving your test taking skills and score.

On the other hand, you probably should know everything listed in those books anyway. So I wouldn't advise against using them to patch up any holes; just not for the GRE.