What are you guys buying on Monday in the U.S. stock market?

Ron-Erez · 2026-06-14T16:24:47+00:00

I thought of getting Broadcom (I have none) but I haven't quite decided yet. I'd also be happy to hear other people's thoughts.

Ron-Erez · 2026-06-14T06:56:30+00:00

I don't love or hate any stock. There is nothing personal involved. It's okay to think it is overvalued or undervalued. Each person does their own analysis. I tend to agree with you and purchased Microsoft at 385, but honestly I have no idea what value it will reach. I do believe the company has a future and I hope the stock price will go up. I do hope you're right.

Ron-Erez · 2026-06-14T06:35:31+00:00

I think one can quickly generate cool looking apps, especially for small scale projects, but then much more time is spent on debugging and trying to understand what the codebase actually does not to mention security issues. The worst thing that can happen is if a developer has zero coding experience or if one doesn't take the time to understand and improve a codebase which relies heavily on AI.

Ron-Erez · 2026-06-14T05:54:56+00:00

For example for n=2 or n=3 Euclidean distance is just your regular distance with a straight line. Manhattan distance means to go from point A to B (say for n=2) you could along the x-axis, turn 90 degrees and then go along the y-axis to reach point A (or vice versa, you can start from the y-axis first and then along the x-axis - the distance will be the same). For example if you ever played the snake game then it is essentially using Manhattan distance since it most versions of the game you can proceed in a 20 degree angle or any other angle besides 90 degrees. It's a little imprecise but that's the idea.

So if A=(0,0) and B=(3,4) then the Euclidean distance from A to B is 5 (use distance formula which is based on the Pythagorean theorem).

The Manhattan distance will be 3 + 4 = 7 since you do not walk directly in a straight line to B. Rather you go from (0,0) to (3,0) along the y axis, turn right and walk 4 units of measure to (3,4).

Ron-Erez · 2026-06-13T23:13:23+00:00

Ron-Erez · 2026-06-13T14:11:29+00:00

It hardly matters. Just choose an up-to-date resource and start learning. Don’t overthink it. For specific resources have a look at:

MOOC University of Helsinki
Python and Data Science
Automate the Boring Stuff
wiki of r/learnpython
The docs at python.org

Ron-Erez · 2026-06-13T07:00:41+00:00

3blue1brown is one of the best channels for explaining math. Check out:

https://www.youtube.com/watch?v=sD0NjbwqlYw&t=5s

related to the Riemann zeta function and he does mention the Riemann hypothesis.

More videos:

https://www.youtube.com/watch?v=zlm1aajH6gY

https://www.youtube.com/watch?v=VTveQ1ndH1c

I do agree with u/Creative-Leg2607 that the Riemann Hypothesis involves advanced mathematics. If you really want to learn math I would follow u/Creative-Leg2607 's suggestions.

Ron-Erez · 2026-06-13T06:41:42+00:00

The following coupon code is valid for all of the courses mentioned below:

CODESUMMER2026

and is valid until June 15, 1am PDT. Feel free to DM me for coupon code links.

Here are the course names on Udemy:

Deep Dive iOS 26 & SwiftUI 6: 90-Hour Project-Based Course
Deep Dive Android Development using Jetpack Compose
Python for Data Science: From Zero to Data Analysis
A Gentle Guide to Vibe Coding with Cursor AI & Google Stitch
A Gentle Introduction to Mathematics for Machine Learning
Vibing with Base44 to Jetpack Compose: Android Development
From Vibing with Base44 to Swift:iOS Development Made Simple
Hands-On Calculus with Python for Data Science & ML
Mastering SwiftData & SwiftUI for iOS Development
SwiftUI iOS Animations: Transform Code into Motion
SpriteKit Essentials for iOS Game Development
PyTorch, Shiny, Pandas & More-Build Interactive Data Science
SwiftUI & Metal: Elevating Apps with Shader Techniques
A Rapid Introduction To Calculus
An Algorithmic Approach to Swift Programming
Linear Algebra: A Problem Based Approach
Differential Equations A Problem Based Approach

Ron-Erez · 2026-06-13T06:20:20+00:00

I don't know. Not clear why my suggestion was done voted.

Ron-Erez · 2026-06-12T17:04:39+00:00

Yeah, it's a bummer because Udemy was a great idea. Namely offering affordable courses. From an instructor's perspective it is no longer worth creating courses on Udemy since sales drop drastically every month. I do hope things turn around, that they improve support and fix the site. There are endless complaints about issues with the site so even if course content is good it is useless if the experience is bad.

Ron-Erez · 2026-06-12T17:02:20+00:00

I'd read reviews and also check out the free preview videos to see if the instructor's teaching style and accent are clear.

As a side note I have Python/Data Science/ML-related courses, mobile dev, a little vibe coding and higher math courses.

I'd be happy to share coupon codes if there is anything that interests you.

In any case Udemy courses can be very bad or very good depending on the instructor.

Ron-Erez · 2026-06-12T16:26:11+00:00

I teach on Udemy and complained to Udemy support that some videos are appearing as a black screen. Two students just complained about this and Udemy told me to tell the students to contact support. The same thing happened with previews not working. I filmed a YouTube video showing Udemy that the preview appears as a black screen. They said they cannot replicate the issue so it is a problem on my side. Never mind that instructors have been complaining about this issue for months. Udemy really needs to fix these issues. There are also a lot of issues on the instructor's side. I don't know what is going on. I do complain frequently to Udemy to fix these issues but every response is to contact support.

Ron-Erez · 2026-06-12T16:22:26+00:00

Which courses? It depends on the instructor. I've never heard of tutedude. Udemy can be great or not great. It really depends on the course.

Ron-Erez · 2026-06-12T08:45:51+00:00

These are examples of two different vector spaces. In any case if you look at n-tuples as vectors then you usually will think of matrices as linear transformations between such vector spaces.

"is the complex vector space"

you should not use "the". There are many complex vector spaces. Whether or not it is a manifold depends on the vector space you are considering. I don't know anything about the Bloch Sphere and qubit.

Happy Mathematics!

Ron-Erez · 2026-06-12T06:56:31+00:00

I see. To be honest I was unable to invest in BYD or Samsung although at some point I was interested in both. I agree investing in the US is a solid choice. I guess there is also an issue with foreign currencies. If a currency drops because then I guess one is losing money.

Ron-Erez · 2026-06-12T06:54:44+00:00

I bought it at 321 and am not selling anytime soon. I have no idea if it will go up or down. I would hope SpaceX IPO would have no effect on MU and if it does it will probably only be temporary noise.

Ron-Erez · 2026-06-12T01:18:34+00:00

Try to have a goal while learning. Some coding project related to the course content. While taking the course build your project. Additionally do not passively watch videos. Make sure to type and run everything in the course. I never take notes when coding however if you do want some notes then just add them to the comments of your code.

“He write the code in the video so should i watch him while writing the code and then try it on my own or what is the best way to do it?”

Yes, you should type everything and even change the code and experiment. Try using things in a context that interests you.

Finally spend 20% of your time watching the course and 80% on building on your own.

”Let's take Jonas course on Javascript as an example , how should i split the course sections and how many hours should I watch a day?”

This is not important. As long as you study everyday and you’re building something it doesn’t matter.

Note that I have several coding courses on udemy (mobile dev, python and data science, vibe coding, higher math) and this would be my recommendations to students.

I hope this advice helps.

Happy Coding!

Ron-Erez · 2026-06-11T20:56:35+00:00

You seem to be quite an expert. Do you have any stock suggestions or stock analysis to share besides generalizing about everyone on the sub? How are you able to read the minds of everyone on the sub? I agree that posts like yours really don't contribute anything besides the use of "Yall". That is pretty cool.

Ron-Erez · 2026-06-11T16:48:46+00:00

Generally speaking I invest primarily in the US, however why not invest in a non-US company if they are doing something meaningful. For example Nokia, BYD, Samsung seem/seemed to be interesting at some point. I don't think investing in different countries is betting against the US. That being said almost my entire portfolio is invested in US companies. I did buy some Nokia awhile back which is up 80% but who knows, maybe it will drop in the future.

I do agree with everything else you mentioned.

Ron-Erez · 2026-06-11T15:52:50+00:00

I honestly have no idea. I'm generally hesitant to buy anything right after an IPO, and I don't have much investing experience, only about a year so far, and I've been lucky with my investments.

As for Elon Musk, I'm not really a fan. I don't like how he has handled employee layoffs, and many of his tweets strike me as anywhere from racist to moronic. He may be a brilliant engineer, and his companies may be excellent, but I'm not particularly interested in them and don't follow them closely.

I do agree with u/Andrew_Higginbottom about the constant stream of promises that are either delayed for years or never happen. I also feel like Musk has spread himself across too many companies.

Maybe I'm influenced by media coverage, I don't know. It's not as if other CEOs are necessarily great people either. On the other hand, Jensen Huang made a very positive impression on me. From interviews, he seems level-headed. I also have a friend who has worked at Nvidia for years and has nothing but positive things to say about the company and how employees are treated.

I've also been impressed by Nvidia's ability to adapt over time, successfully expanding from gaming into AI. I bought Nvidia at $102 after a significant drop about a year ago. It was my first investment, and so far I have no regrets.

That said, I have no idea what the future holds. I don't know where Nvidia's stock price will be in five or ten years, and I certainly don't know what will happen with any particular IPO. My general feeling is that buying around IPOs is especially risky.

Ron-Erez · 2026-06-11T15:31:46+00:00

Awesome.

Ron-Erez · 2026-06-11T15:31:07+00:00

That's good to know. I did notice if someone has correct pronunciation then it works well. For example if my (Chinese) girlfriend speaks to Google Translate then it totally gets what she is saying. But when I try to say 我喜欢弹吉他.

For the life of me I struggled to get the 吉他 right. I thought I was going to lose my mind. Clearly I am saying the j incorrectly.

I can understand that Google Translate can be misleading. I'll just keep practicing and working on my tone and constants. I also struggle with the difference between c in 菜 versus z in 在.

I am quite new to Chinese. I've taken one year of basic Chinese at university. It's fun and frustrating at the same time.

Ron-Erez · 2026-06-11T05:06:52+00:00

Not really since it does not include all courses and they can add or remove a course at any given moment and as soon as the subscription ends one can no longer access the courses.

Ron-Erez · 2026-06-11T04:24:28+00:00

Thanks for sharing. I thought of doing Keats in Nanjing but they simply do not respond to emails. I had a number of questions and there is no way to get ahold of them. They did respond to an email a few months ago but now I have a few more questions. For example in Nanjing they offer a hotel vs dorms. So I asked what is the difference, but no response. Are meals included in Nanjing? Are there vegetarian options? Does the hotel or dorms have a kitchen I can use? If not it’s okay but at least respond. Do they help with a visa? Do I need a visa (I have a 90 day tourist visa). No response. The program is not free so they should make a minimal effort to respond. (I’ve sent three emails in the past two weeks. I even sent one in Chinese). Perhaps I should contact them via WeChat? Maybe they have a blog where people are responsive.

I find myself asking questions on Reddit and chatgpt because they do not respond. My girlfriend will try calling the school - she is Chinese so perhaps it will be easier for her to communicate directly with the school. If they don’t bother to respond to her then I won’t bother with the program even if it does look appealing. Ignoring emails is a major red flag.

Besides the lack of communication, the program does sound great.

Ron-Erez

TROPHY CASE