Archive · page 2

Titanic. Age. We [started](<https://t.me/phys_math_dev/135>) talking about the Titanic dataset. Let's discuss the Age factor. We saw that Sex, Pclass and Embarked are strong features and to study them we used that these

Tiny math problem anniversary Ten years ago I accidentally invented an easy but funny mathematical problem. Let a long decimal number be "a". We permute digits and get "b". Is (a - b) divisible by 9? The answer is obviou

I'm not totally original While I was digging into [this area](<https://t.me/phys_math_dev/134>) on my own, with heavy help from ChatGPT, of course, I never expected that I have a completely new result. On Monday my colle

How to survive in the new reality Probably the best explanation "How to stop worrying and love agents." In order to succeed you have to: 🟢 Hone your expertise 🟢 Use LLMs as chat, agents, tools - whatever helps you move f

Mystery code Later I'm going to explain in detail, what is going on. For now I'm curious whether this subject is trivial. If you can, feel free to answer the following questions in the comments: ❓ How come that the guess

DIY. Physics laboratory We started a small educational project. A short ride to the Vernisage flea market brought us: ⚗️ Holder for chemistry experiments ⚗️ 5 springs ⚗️ old Soviet set of weights In a chat session with C

Childhood memory While my next brainy post is baking, let me share with you a picture from my childhood. I took this photo just today in the morning on my way to the office. The thing is that in 2026 in the Yerevan metro

Reality check Yesterday I posted a hand-drawn sketch of the metro station. But I totally forgot that you can just take a photo of the place. Today, on the way to the office, I took this shot. Now you can compare the sket

Baghramyan mystery revealed [Previously](<https://t.me/phys_math_dev/146>), I posted three mysterious photos. Today, let's solve the puzzle. These triangles are the result of a strange coincidence. Shadows of handrails i

Web mirror of phys_math_dev is alive! It was… kinda terrible. Not when Codex wrote the code. Not when I deployed it to GitHub. It started when I logged into Cloudflare and began clicking around in the GUI. The real pain

Baghramyan mystery I made these three photos of an escalator steps of Baghramyan metro station in Yerevan. These black and white triangles in the middle of the step intrigue me. After the third attempt ChatGPT gave me cl

RAG is dead, long live agentic retrieval [Video](<https://www.youtube.com/watch?v=60G93MXT4DI>) touches a question I keep bumping into lately: do I actually need to learn RAG? Very roughly: RAG is a way to preprocess you

How Codex is built I'm actively using the "Codex" agent in my work and it has always intrigued me how it works. I even wanted to find a repository with the source code and read it. Fortunately, today I stumbled upon a [l

Element of 2D sort I don't have a fully cooked idea today, so let's discuss half-baked. In The Farmer Was Replaced game there is a subgame where you plant cacti. Quite a complex description of game rules boils down to qu

Table with leaves Who would guess that these wooden foldable panels on the sides of a table are "leaves"? Not only decision trees and bushes have them.

Periods in digits and remainders I'm preparing a post with a solution for the first problem in [the post](<https://t.me/phys_math_dev/138>) . And there is a small question which has irked me for a while. When we calculat

The Deleted Photo A long long time ago my colleague lent me a short-focused lens for my camera. I tested it for a week and this is my favorite shot from that week. Just after I took this shot, it turned out the place was