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Group emblem Nobody asked me, but I’ll tell you how the channel emblem was born: one quick pen sketch + a single prompt in ChatGPT. ``` It's an approximate version of the sign for telegram channel. Channel name is phys_m

EGBDT Logloss - Learning curves There were already two posts about the synthetic LogLoss dataset. [The latest.](<https://t.me/phys_math_dev/68>) Let's discuss an experiment with this dataset. The dataset has two groups

NotebookLM I’m working on a presentation about gradient-boosted decision trees. It’s definitely not my first rodeo: I’ve made decks in LaTeX/Beamer, Word, PowerPoint… probably a few other things too. These days it feels

For TFWR solutions discussions In comments to this message we are conducting code review for The Farmer Was Replaced programs

New school level physics problem There is an old physics problem: two holes in the wall of a jar with liquid. The depth of the first hole is x, the second is y. You are to find: the horizontal distance from the jar wall

Not exponential. This time. Guys, there’s always an exponential lurking somewhere. When the rate is proportional to the amount, the amount decays exponentially: a capacitor discharging through a resistor, detergent washi

Pouring-out velocity When solving physics problems at school, I used a standard formula for the velocity of a jet pouring out of a hole, given the pressure inside the liquid and its density. But for a long time I couldn’

Water jets In my childhood library there were many DIY books. One of them, written for young pioneers, described a small setup that demonstrates how jet velocity depends on pressure. At some point I managed to find three

2025 in a nutshell. Kinda... As the owner of this channel and its promoter, I hang out in a lot of Telegram channels. Now there are many posts with promises for the next year. I definitely don’t want to make the gods lau

English joke of the day Vegetarian eats vegetables. Guess what’s for the humanitarian.

Cannabis curve There is a [special page](<https://mathworld.wolfram.com/CannabisCurve.html>) on Wolfram MathWorld dedicated to a very specific equation in polar coordinates. ``` r(θ) = a·[1 + 9/10·cos(8θ)]·[1 + 1/10·cos(

[Chat for discussions](<https://t.me/phys_math_dev_chat>) Feel free to discuss things there [invitation link](<https://t.me/+Au96VWrWbB5iYmIy>)

Walrus operator To finalize previous post. ```python n = 0 while (s := input()).lower() != "конец": n += 1 print(n) ``` I think, it's the most elegant approach. But it uses "walrus operator" which appeared only in python

De Morgan's rule One of the subscribers brought me a problem. Roughly, it sounds like this: “Read standard input and count strings. Stop counting when the user enters конец or КОНЕЦ.” The question was how to write the lo

Algorithm Flood In comments you can bring interesting programming tasks and discuss it

Qbasic and polar coordinates I think it's quite a controversial take. Progress gives us far more powerful computers, instruments nobody could imagine 5 years ago. And still qbasic feels like the best way to start writing

Word of the day: spendthrift Spend means “to give away”, thrift — “to keep”. If you know these words, spendthrift may sound like “keep your money while you can”. And that would be totally wrong. Spendthrift means to spen

Sine cosine machine I’m a physicist, and for me sine and cosine are first and foremost laws of motion: the horizontal and vertical shadows of a pin on the edge of a rotating disc, cast on a wall. Some time ago I decided