Today is the last Pythagorean theorem day of the 21st century. The day comes from the day month and year.

24² + 10² = 26²

I started my masters, and I got my lowest mark ever of 55% in my topology final. My professor called me in to ask me if I had any issues in my personal life, which made it worse because I had to tell him that I just didn't work hard enough. It was compounded by the fact that he said multiple people got full marks in the course.

I think my ceiling was undergrad level maths. I'm pretty overwhelmed with the workload of a postgrad, and I think this isn't really for me, which is weird because in my undergrad, I thought that I wanted to do maths for a living.

Hi everyone!

Last week I shared a few screenshots of ViCalc, and based on feedback, I’ve put together a short video demonstration to show what the touch-typing workflow looks like in action!

I’ve been using physical pocket calculators since the mid-1980s, and I’ve always loved the speed, tactile feedback, and direct control of hardware key layouts. The main motivation behind ViCalc was to bring that exact same speed and workflow efficiency to a modern PC keyboard—allowing you to touch-type mathematics seamlessly without taking your hands off the keys to click UI buttons.

Rather than just imitating a physical handheld calculator, ViCalc is built to optimize desktop mathematical workflows and complex calculation tracking.

🧮 Key Features & Workflow Design

• Direct Keyboard Mapping: All functions and operations are directly mapped to your PC keyboard, eliminating the need to click through UI buttons with a mouse (though mouse/touch interaction is fully supported if preferred!).
• Full & Exportable Calculation History: The entire step-by-step history is logged automatically as you work. This makes it effortless to review your process or copy-paste the entire multi-step calculation directly into research notes, or technical reports.
• Flexible & Adaptable GUI:
  • Minimalist View: Hide virtual keys entirely—ideal once you learn the shortcut mappings by heart.
  • Custom Views: Toggle between a standard numpad, a compact left-side layout, or a full scientific keyboard layout.
  • Expandable History Pane: Easily track, review, and manage long sequence calculations.

🛠️ Modes & Technical Details

• Scientific & Complex Modes: Full suite of trigonometric, scientific functions, and complex arithmetic support.
• Programmer Mode (Base-N): Bitwise operations and conversions across Hex, Dec, Oct, and Bin.
• Language: Python 3
• License: Open Source (MIT License)

🔗 Links & Downloads

• GitHub Repository: github.com/Kudaschov/ViCalc
• Homepage: kudaschov.de/en/vicalc-4

I’d love to hear your thoughts, feedback, or any feature requests from the community! How do you currently handle rapid calculations and history logging on desktop?

hey can anyone explain me the lambda calculus and its use cases in turing machine and how it helps the programming languages in a very simple way !!!

Thanks and really excited to read you explanations .

https://m.youtube.com/shorts/xQLDV86UGqY

People keep saying its 9 even though its obvious its a fraction and should be 1 havw these kids never learn fraction in 5th grade?

How do I decide which test to use for checking the convergence of an infinite series?

The tests which are in my syllabus are:-
1. Comparison test
2. Limit Comparison test
3. D' Alembert's Ratio Test
4. Caunchy's nth root test
5. Raabe's test
6. Cauchy's condensation

Open sets in this topology are the subsets of R which have compact complements(compact in the usual topological space), alongside the empty set.

Hello! I'm a computer science student studying abroad and I have a little brother, who is in his 7 grade.

He likes math and logic, he plays chess a lot and I really like it in him. I see a lot of myself in him and I really like it.

Being 14 hours abroad from him made my part of "brotherhood parenting" kind of hard to perform. He lives in a small town in the US and our parents work 2 shifts so he is usually left unattended.

He is good at math and he likes it. He is not the best, but he is still good. I just want to ignite more passion in him about it.

I definitely don't want to force him to do anything he doesn't want to.

So my question is, if any of you have a video, kind of a movie that shows how interesting and beautiful math is?

He is taking Algebra 1 classes right now, if it could help in any way.

"If we take a stick one foot in length and cut one half from it each day, we will never reach its end."

If we cut one half from it every day, what volume will be left after an infinite number of days?

Also, if we had an infinite number of these sticks that have been divided in half for an infinite number of days, would we have an infinite volume, or zero?

I'm in highschool and it's my 4th year now. But I still don't know math(like algebra and advanced stuff)except arithmetics ever since elementary. It is hard to catch up with my classmates and I was wondering what I should do to get good at it

i’ll go first : as someone who does chemistry, physics , applied maths etc on a pretty much daily basis , i absolutely cannot do dates in my head. what date is it going to be next tuesday? no idea. the amount of times i’ve mistakenly believed i have an exam in two weeks when it’s about four weeks away is dreadful! bonus one , cant lace up my doc martens without missing a lace hole lol

My doubt is this, for undirected graph, between every two vertices a walk of some length 1 to n-1 is sufficient.

And for strong connected digraph, it's 1 to n and this two different formulas. Also if trival walk is allowed in the undirected case why is it not considered in the directed one

I know there are better formulas but I'm proud of my own formula and wanted to show it to you.

My doubt is this, for undirected graph, between every two vertices a walk of some length 1 to n-1 is sufficient.

And for strong connected digraph, it's 1 to n and this two different formulas. Also if trival walk is allowed in the undirected case why is it not considered in the directed one

I have a math degree but since i teach high school math i feel like im not really a REAL mathematician? Like how did I even pass those classes in college it feels like a fever dream. anyone else relate??? i feel like i couldn’t do it again if i tried.

Please let me know if this is allowed or welcome on here.

I picked up this drafting table a recently, and these are some of the first drawings I’ve been able to do on it.