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Hello, I think you're spot on about it making your life easier after struggling, and by taking this class and putting in the time, it will make other math courses much easier for you. Because of what you gain from the struggle, I would really recommend you take this over 142, if you have the time. I took 140A last fall, and although I only got a C, it took an immense amount of effort to even get that. The class is set up so that if you put in the hard work to understand the concepts, the homework, the proofs and so forth, you're gonna do well, and If you truly understand how to solve the homework problems, then the tests will be familiar (doesn't mean it will be easy).

Expect to put a lot of work in. This statement needs to be taken seriously for this class, I've talk to some people in the class who say they put in 40 hours a week. This is usually because the concepts do not come immediately and you have to constantly repeat and approach at different angles to find a good understanding.

I recommend having a supplementary text while you are studying from the dreaded Rudin. For 140A, you should be looking at compactness and chapter 2 very early on as this is a big hurdle in that class. Other concepts will be more familiar but still challenging.

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Some recommended texts (definitely find your own that works for you)

https://www.amazon.com/Real-Analysis-Lifesaver-Understand-Princeton/dp/0691172935 (If you prefer "casual" explanations of the concepts, this help me survive chapter 2 of Rudin. There are useful book recommendations in the very back)

https://www.amazon.com/Elementary-Analysis-Calculus-Undergraduate-Mathematics/dp/1461462703 (Ross is used for the 142 series, and I find it is very helpful if you are struggling. If you are having trouble, start with the easier version of a problem and build up from there. The book mainly stays within the R\^2 metric, which is what makes it simpler)

https://minds.wisconsin.edu/handle/1793/67009 (at some point, you're gonna get stuck and you will have to look at the solutions. This is ok, but don't become reliant on it, that really hurt me in the end when I did that. Some of the questions are fuccckkkiiinngg hard, so when you hit that wall, take a look here. They give solutions that skips over a ton of steps, or might not be that good of a way to solve the problem, but this is a great resource)

https://www.math.ucla.edu/~tao/preprints/compactness.pdf (Who doesn't know who Terence Tao is? This is very helpful for giving an answer to "what is compactness used for?". It gives some intuition about what it is, and you should read it a couple times during 140A.)

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So this is advice that I would give myself when entering the course, and maybe it won't apply to you. Since you got an A in 109 without too much trouble, you are definitely very ready for 140, and you have a very chance of succeeding. Stay curious, and don't stop at just the solution. Really question why it is true. You probably won't have this problem, but when it hits you (probably when you get to chapter 2) you have to keep at it and don't give up. Abuse office hours, ask lots of questions, study everyday etc. and you'll do well. If you want to get better at math then the pain is worth it.

You don’t quite need the undergrad econ besides basic game theory and maybe bit of operations research if your gonna go the computational Econ route. Even so, you should be able to pick up algorithmic game theory and mechanism design with just with algorithms and probability theory background. You prob can pick up optimization theory in the side as well. So my recommendation is to take math cs and pick up game theory and OR courses for electives .

These are pretty fascinating books and some interesting applications of computational economics if you’re ever interested:

https://www.amazon.com/Geospatial-Abduction-Principles-Paulo-Shakarian/dp/1461417937

https://www.amazon.com/Handbook-Computational-Approaches-Counterterrorism-Subrahmanian/dp/1461453100

While this suggestion may not help sound proof your door, I suggest using ear plugs. I have been using the below linked earplugs for years. They don’t block out all sounds, but you won’t hear whispers from another room, or even a lot of outdoor noises, neighbors footsteps, etc. I use them when studying, sleeping, relaxing, etc.

There also good because you can keep a pair with you all the time so when your at Geisel or taking a test and some noise is just driving you crazy, you can block most of all
Of it out and focus. They are also good for concerts so you can hear the music and singing better without blowing out your ear drums.

They’re less than $10 shipped with prime.

Mack's Ultra Soft Foam Earplugs, 50 Pair - 32dB Highest NRR, Comfortable Ear Plugs for Sleeping, Snoring, Work, Travel and Loud Events https://www.amazon.com/dp/B0051U7W32/ref=cm_sw_r_cp_api_zEVIAb0HHNDC4

Barbecue regulations

So it sounds like you can run a propane BBQ (e.g. I've had good luck with this one) on any open grassy space.

Not sure what that's got to do with the other stuff. But I have always wondered why I don't see more random grilling going on.

Mack's Ultra Soft Foam Earplugs, 50 Pair - 32dB Highest NRR, Comfortable Ear Plugs for Sleeping, Snoring, Travel, Concerts, Studying, Loud Noise, Work https://www.amazon.com/dp/B0051U7W32/ref=cm_sw_r_cp_api_i_wp90DbVRFDFRW

It may be too late, but take a look at this book.

I purchased this book and solved 3/4 of all problems in there. There are step-by-step solutions and they explain everything very well. A lot of students waste their time solving easy circuits, when they really should be focusing on strategies for solving harder circuits. I highly recommend you do at least 3/4 of the problems in this book, or focus on sections where you think you're weaker in.

Do 100 circuit problems and you'll never be scared of circuits again. (Until you take 65, I guess).

Here's the ones recommended by Albizati:

Model 1

Model 2

Model 3

You could settle for anything from Amazon though. They all practically do the same thing

scientific calculator like something casio and matlab for the rest.

I recommend Grokking Algorithms and The Algorithm Design Manual.

I wrote the textbook for CSE 100, but I set it to the lowest price Amazon would let me and I make it accessible to everybody online for free :-) take my class pls

This is the one I ordered. It arrived and is being installed today.

https://www.amazon.com/APEMAN-Driving-Recorder-G-Sensor-Recording/dp/B07RBL2YR3/ref=sr_1_6?crid=UE6EC3UL2HK&keywords=front+and+rear+dash+cam+with+night+vision&qid=1571849879&sprefix=front+and+rear+dash+cam%2Caps%2C264&sr=8-6

https://www.amazon.com/gp/aw/d/1572243376/ref=pd_aw_fbt_14_img_3?ie=UTF8&psc=1&refRID=8MX1NXGD12519MT0KCK0

https://www.amazon.com/Numerical-Analysis-Mathematics-Scientific-Undergraduate/dp/0821847880/ref=sr_1_4?ie=UTF8&qid=1523311191&sr=8-4&keywords=numerical+analysis

use that young student prime

https://www.amazon.com/gp/aw/d/055880540X/

The one that's making the rounds at work is The Second Machine Age. I haven't read it yet but that might be more up your alley

Europe's Last Summer, David Fromkin

https://www.amazon.com/Europes-Last-Summer-Started-Great/dp/037572575X

Use this book:

Electric Circuits Problem Solver (Problem Solvers Solution Guides) https://www.amazon.com/dp/0878915176/ref=cm_sw_r_cp_apa_aiVUAb1ZA4DPV

30 minutes to an hour of problems every day, and you'll pretty much be able to deal with any problem that will be thrown at you in 35 with no trouble. Do the problems that they give you for homework too, basically just get as much practice in as you can before quizzes/tests