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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

Use mouth tape, prevents mouth breathing and snoring.

Sleep Strips by SomniFix - Advanced Gentle Mouth Tape for Better Nose Breathing, Improved Nighttime Sleeping, Less Mouth Breathing, and Instant Snoring Relief - Pack of 28 https://www.amazon.com/dp/B076CQ1NR8/ref=cm_sw_r_cp_api_i_B4o1Db6ZVGXY3

Sorry I don't have anything immediately to help but FYI, these things are pretty useful: https://www.amazon.com/Cleaning-Wipes-Special-Cleansing-Solution/dp/B07DQW5HCS/ref=sr_1_4?keywords=shower+pill&qid=1570135637&sr=8-4

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

I ride a knock off penny and it allows me to not worry about barely making it to classes that are ten minutes or more walking apart.

I have friends that have trouble with their trick decks but if you have large wheels there's always a serviceable path from any two points on campus. There are some big bumps and chunks missing in the ground in certain places but you'll quickly memorize where they are and know to avoid them. I personally like having a shorter board because you can stick it underneath a lecture hall desk instead of leaving it at the entrance.

Going downhill is pretty fun too.

Usually if you buy a new bike from a shop, they'll offer free tune-ups. I have no idea what that includes, though it probably doesn't include too much of adjusting your bike to fit you - I assume it's more things like truing the wheel (making it straight if it starts to wobble) and re-adjusting the shifting and brakes.

Honestly I think it's good to get handy with an allen wrench & screwdriver, and learn to adjust whatever you can yourself. Self-sufficiency and all. With all the videos on YouTube these days, there's nothing you can't learn. There are bike "repair stations" around campus, some of which haven't had all their tools stolen yet (though as far as I know, none of the tire pumps work anymore), that might at least be a step up from turning your bike upside down outside your dorm for some adjustments.

This is actually the second time I've made this comment in this subreddit (looks like there are a lot of snorers at UCSD), but these coupled with these can basically block the noise of an airplane from two feet away. For around 30 bucks total it can be well worth it. Really, just normal ear plugs work great for your average loud roommate, but if you get one of the super loud obnoxious ones, you probably need both of them.

I would stay away from UCC. They pretty much only deal in Specialized bicycles which are usually over priced for the components that you deal with. I've been riding for a while and essentially, the different brands are simply stickers on the frame. What you want to look for are the components (frameset, derailleurs, forks, etc).

In terms of locks, buy a nice OnGuard lock that has a U-lock and a cable lock for the front wheel. Lock it like the Sheldon Brown technique.

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.

http://www.amazon.com/dp/B015PYYDMQ/?tag=portablepicker-20

Buy a 1-2 TB internal HDD to stick inside since there's room. It can run all of the programs needed for CSE classes easily, and can run games like the Witcher 3 at medium settings at good framerates. If you want, I can try to get you some exact #s.

The most popular multivitamin on the market is this one. You don't need 500% daily value of Vitamin A or whatever Optimen does.

An electric hot water pitcher/heater will be very useful especially for ramen and instant noodles. Much faster than boiling water on the stove.

This is the one I inherited from my sister, but you can get eletric kettles, legit asian water boilers, etc. You get the idea. :)

I got this one my freshman year and every one of my friends who have slept on it loved it. It's more squishy and soft during the summer but does get firmer when the weather gets cold, as all memory foam works. Just warming it up with your body for a few mins brought it back though..!

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https://www.amazon.com/gp/product/B002NEG15E/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Is the SPARC text absolutely necessary for 30? I just started looking at the syllabus--trying to figure out the best way to get ahead over the break.

Step 1: Sign up for the $35 Time warner 1.5MBps plan. Be nice and ask/push for a waved technician fee. 858-695-3220
Step 2: Buy a used Docsis 2(Up to 3MBps) modem for $15.
Optional Step 2.5: Buy a router. Which router is up to you. ($30-$110) If you don't want lag due to wifi, splurge on this :http://www.amazon.com/RT-N66U-Dual-Band-Wireless-N900-Gigabit-Router/dp/B006QB1RPY/ref=zg_bs_300189_2
Better yet, get router with a built in 4port switch and use LAN.
Step 3: Call TW retention (or ask to be transferred) on Day 2 after installation. Tell them your "parents" are complaining that you are paying a high rate for service than them. ($30 was standard for a while and I have that grandfathered for home service) They will give you a $5 6month discount. Call back every 6 months to save $30.

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

a cable is like 4-8 bucks off amazon

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https://www.amazon.com/Belkin-F3U133b10-Hi-Speed-Cable-Type-B/dp/B00004Z5M1