Geometry question:

I have a light (in parallel beams) shine on an object and the object casts a shadow on a plane that is at 90° to the direction of light.
When I now angle the plane to 45° degrees, the area of the shadow is spread out over a larger area of the plane by a factor of √2.

But if I angle the plane 45° on one axis, and also 45° on a second axis, is the shadow now stretched out by a factor of √2 times √2?

#math #geometry #triangles

Someone's child failed a calculus test and asked me to help her study. I found thst for her, if we do the equations competitively she enjoys it.

I am having to learn the rules of her math along the way. For me, the square root of -1 is I. For her, it is undefined.

#math #calculus #homework

An amateur mathematician fed an #Erdős problem into GPT-5.4 Pro that humans have been working on for 60 years

"Previous #LLM solutions to Erdős problems used standard techniques, this one took an entirely different approach. Rather than starting from Erdős’ original probability-theory-based framing of the problem, as human mathematicians had, the LLM found an alternative route… that led naturally, in less than a page, to a correct proof"

We're fucking toast

https://physicsworld.com/a/ai-led-solutions-of-erdos-problems-spark-debate-over-the-future-of-mathematics/

#Math #AI

Whaaa? Not having uniform math standards for assessing admissions isn't working? <shocked> How can this be? 🙄

✅ Citing ‘severe’ math deficits, UC faculty demand a return to SAT tests for STEM applicants
https://www.latimes.com/california/story/2026-05-27/uc-math-professors-demand-return-of-sat-for-stem-admissions
#sat #uc #math #stem

@Strandjunker We *are* the ‘system’.

#Americans have *allowed* the #MAGA cult and #BananaRepublicans to ‘drain the Treasury’ and trash the reputation of the #UnitedStates by *refusing* to abandon the party system that the #FoundingFathers *intentionally* left OUT of the #Constitution. They saw that that it was a cancer on #UKpol - with Whigs and Tories responsible for the same corruption #Democrats and #Republicans wallow in now.

Use #math to flush the 💩, #PrimaryFromTheCenter.

#ShitIFind #math #dadjokes

Is there a program equivalent to

printf("Hello World!\n");

in Geogebra?

And if so, is there a tutorial or book that teaches to poor dumb programmers with examples like that?

#Math #Maths #Geogebra #Programming

@futurebird Credulous people in #Tennessee who follow #Qanon (#Russian propaganda) and voted for #Trump three times for #POTUS - because he was going to put #pedophiles in prison and keep the #UnitedStates *out* of any #WarForOil - will be damned if they vote for his cowardly stooges again!

The #2026midterm election will be a #BlueTsunami and #gerrymandering will make the #Democratic gains *bigger*.

#PoorlyEducated #BananaRepublicans don’t do #math. 🤷🏻‍♂️

My calculus book dates from the seventies, and introduces derivatives at page 90.

#Calculus #Math #Maths

https://youtube.com/shorts/3o3zcMTBPZc

This is a fun one – can you solve our latest #ACMCoffeeBreakPuzzle? What number would come next in this sequence? 🔗 here for more: https://www.acm.org/education/coffee-break-puzzles

#computerscience
#puzzle
#math
#cs

NESHacker on Basic NES Platformer Movement
A 6502 is not a bad little machine, but it does require efficient coding to get decent real-time results. NESHacker dives into basic Mario-style platformer movement in a 10-minute video

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

The main portion of the video goes into subpixel movem
https://setsideb.com/neshacker-on-basic-nes-platformer-movement/
#development #retro #6502 #assembly #development #mario #math #NESHacker #platformer #retro

@jeffowski Now do #Math and #Chemistry teachers, too!

Maybe the decades long drop of standardized PISA test scores for students in #American #PublicSchools should be cause for alarm? 🤔

There’s a *reason* #Trump famously said “I *love* the poorly educated!” after he won his first primary during the #2016election in #Nevada. https://youtu.be/O9F6EAMPky4

#Resist intelligently!

RE: https://mas.to/@kityates/116458409259644028

Make America Think Again

in which "Again" is doing some heavy lifting.

#MATH

A brief lesson in how to honor a mathematician:

"This Alternative Heritage plaque adorns the house in Hull where John Venn was born in 1834."

https://www.futilitycloset.com/2026/04/15/set-theory-3/

#math #maths #mathematics #Venn #venndiagram #UK #settheory #historyofmathematics

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Set theory Sepia photo of John Venn on the left. On the right, photo of the current blue plaque in the shape of a two-circle venn diagram. One circle is labeled "mathematician, philosopher, Anglican priest," the second circle is labeled "Really strong beard game," and the overlap is labeled "John Venn"

https://www.youtube.com/watch?v=kYB8IZa5AuE
Now I want to find the maths teacher who taught us this and shake him by the scruff of his neck. Or whoever wrote the curriculum.
#math #pedagogy #3Blue1Brown

@aartaka @neauoire

wikipedia

In the 1980s, Stephen Wolfram engaged in a systematic study of one-dimensional cellular automata, or what he calls elementary cellular automata; his research assistant Matthew Cook showed that one of these rules is Turing-complete.

I find that interesting. They also cover toroidal cellular automata which are actually easier to define the rectangular cellular automata.

part1

#math #CellularAutomata

Duration and the Intervalic Imposition: Thinking about TIME and DURATION. Looking for #feedback
https://philosophics.blog/2026/04/01/duration-and-the-intervalic-imposition/?utm_source=masto&utm_medium=social
#philosophy #physics #time #duration #memory #bergson #kant #Heidegger #husserl #phenomenology #metaphysics #math #maps #blog #podcast #history #reading #writing #essay #comments

Shifting from Parcifal to Parfit, I'm debating the value of moral maths that seem to be an outgrowth of the attempt to couch everything as utility and economics.
https://philosophics.blog/2026/03/30/the-blind-spot-of-moral-maths/?utm_source=masto&utm_medium=social
#philosophy #morality #psychology #economics #utility #math #mathematics #blog #essay #writing #podcast #reading #parfit #reason #academia #enlightenment #medical #intervention #hospital

My debut album. A love letter to science, to rabbits and to mathematics. Please enjoy!
https://djrabbit1.bandcamp.com/album/the-chase
It's called The Chase #math #physics #RiemannZeta #music

Need a break? Think over our latest #ACMCoffeeBreakPuzzle and leave your answers in the comments. 👇

How many times does the minute hand cross the hour hand on a clock in a 24-hour cycle? We’ll tag correct solvers in stories. Check out our website for more: https://www.acm.org/education/coffee-break-puzzles #computerscience #puzzle #math #cs

@Alien_Sunset @HitomezashiBot

Yeah game of life would have to be animated so, maybe a gif.

There's a lot of deep math in the game of life.

I'm curious if you can write repeating animations using game of life on a torus. I am also curious about non repeating games that run a long time/forever.

It gets right into Godel quick.

#math #GameOfLife

They teach you the "English system" on antenna calculations in the US.

468 / Frequency = half wave dipole in feet
Then multiple by 12 for inches, divide by two for each side blah blah blah

In meters, 142.5 / Frequency = half wave dipole... but it corresponds to the band names.

In meters, for a 10 meter dipole at 28.500... you need an antenna that is 5.000 meters (half wave of 10 meters). 🙄 That's WAY EASIER.

20 meters at 14.250Mhz? 14.250/142.5 = 10 meter half wave dipole.

#math #antennas #hamradio

Ooof, this smells of a sign/math error somewhere, ouch.

"...the software that should have pointed Lunar Trailblazer’s solar panels toward the Sun instead pointed them 180 degrees away from the Sun...."

https://gizmodo.com/the-stupidest-glitch-imaginable-killed-a-72-million-lunar-mission-in-a-single-day-2000728962

#software #math #space

#jouRapNal #book18 day 79

20260302Mon

#3goodThings #math #questions #French #threeGoodThings

#ad #mercedes #immersion

Alt...

(steering wheel illustration) Az was gettin an ad for a mercedes on tik tok they sure know thier target market Yt git 44 out of 42 on a math test, while Ma's french teacher only skimmed their 60 answers. try doing every subject except English in a 2nd language for 8 yrs

#jouRapNal #book18 day 75

20260226Thu

#3goodThings #couch #volunteer #french #threeGoodThings

#homelessness #math #verb

Alt...

(illustration of a couch) iL is picking up Yt after volunteering and tells me i may have to couch surf or be homeless Az sent me a Tik Tok where my name was sung Ma is back to hs with a makeup quiz & some french verb conjugations

#jouRapNal #book18 day 51

20260202Mon

#3goodThings #gym #math #french #threeGoodThings

#hairstyling #cooking #semester

Alt...

(calendar illustrated with "new semester begins" on it) Yt has gym, college math & cooking Ma has french, hainstyling & ? Forget what Az has but the twins have spares in 4th period Yt's cooking teacher wasn't there so they just went over safety, similarly in gym but added a couple mini games. Ma thinks their french teacher seems ok, although strict on phones Ma didn't really want hairstyling but don't mind it so far

Alt...

Triangles in pink and blue

Alt...

Math drawing

@pelavarre

P.s. that the python docs needs to call out that 0.0 is considered finite is just very funny to me.

(See isfinite immediately following isclose in the docs.)

#math

@pelavarre

Well their description includes all your points, but it's not clear.

Point 1 is included in the abs(a-b) of the definition.

Point 2 is the expression, which includes the <= comparison operators which will return a bool, so it is correct.

Though I do agree that it should be better documented. I'd assume the usual bug tracker is the best place to submit doc improvements.

The cmathmodule.c doc string documents that it returns a bool and takes complex inputs for a and b (which are not included in the docs)

#math

Spent half an hour tinkering with the visualisation of the 120 5-cells inscribed in the 120-cell - added a new view which removes the 120-cell's edges and gives the 5-cell edges a hectic colour scheme

https://etc.mikelynch.org/fourjs/

#math #maths #mathstodon #geometry

Alt...

A 3-d render of 120 5-cells projected into 3-space. It's like a Biblically-accurate Christmas tree topper or something, the colour scheme is a mess of greens and yellows and purples.

@gutenberg_org For René Descartes, #AI would stand for ‘#ArtificialIdiot.’

#MATH

Imagine a compulsive tendency: the individual collects every free code they can find. Today, they own approximately 20,000 albums (or more, and still collecting everyday).

Is there even a chance they'll listen to yours.. that they just got? Just #math

Remember, everyone is free to do as they please; I'm just trying to understand. :0)

#music #bandcamp

Time to bring out the Christmas
Rhombic Triacontahedron!

#ChristmasDecorations #Math #Maths

Alt...

A rhombic triacontahedron, a Catalan solid with thirty diamond-shaped faces. This one is made up of green and red faces. https://en.wikipedia.org/wiki/Rhombic_triacontahedron

Why can't you focus at work? Can Duruk models it with math for his blog, Just Off By One.

https://flip.it/WXgdqo

#Work #WorkLife #Focus #Math #Mathematics