Making [etched] holograms with a pen plotter https://lobste.rs/s/9iliea #show #art #graphics #math
https://blog.jordan.matelsky.com/Penplotter-holography/
Pustam | पुस्तम | পুস্তম🇳🇵
@pustam_egr@mathstodon.xyz
A lifelong #philomath, #STEM (#Science, #Technology, #Engineering, and #Mathematics) enthusiast, #traveller, #adventurer, and #multipotentialite with interests spanning multiple fields, including pure and applied mathematics, basic and applied sciences, mathematical modelling and analysis, scientific computing, information security (#InfoSec), #geography, #history, and #philosophy.
mathstodon.xyz
This is the part of 2FA/TOTP that many people don’t realize:
Your phone isn’t receiving the 6-digit code from the server.
Instead, your authenticator app acts like a specialized cryptographic calculator. 🧮🔐
It takes a shared secret key, combines it with the current time, and applies the TOTP algorithm to generate a temporary 6-digit code.
At the same time, the server independently performs the same calculation using its copy of the secret key and the same time counter.
Same secret + same time counter + same algorithm = same result.
That’s why your authenticator app can generate the correct code without receiving it from the server.
It’s a simple idea, but a brilliant application of cryptography.
You can even test this yourself: add the same TOTP secret to both Google Authenticator and Microsoft Authenticator. Even if you set them up at different times, both apps can independently generate the same 6-digit code at the same time.
And here’s another important point:
The algorithm doesn’t need to be secret.
TOTP is based on publicly known, standardized cryptographic algorithms such as HMAC. What needs to remain secret is the shared secret key.
So:
🧮 Algorithm/math: Can be publicly known.
🔑 Secret key: Must remain private. Never share it.
⏱️ Time: Isn’t secret.
🔐 Security: Comes from protecting the secret key, not from hiding the algorithm.
That’s a core principle of modern cryptography: A cryptographic system should remain secure even when the algorithm is publicly known. The secret is the key.
#2FA #TwoFactor #Security #Cybersecurity #SecretKey #Authentication #Cryptography #Math #TOTP #OTP #AuthenticatorApp #Internet #SecurityResearch
Natasha 
🇪🇺🇮🇪
🇪🇺🇮🇪
@Natasha_Jay@tech.lgbt
ⓘ Humour. Art. Street art. Random snippets. Recipes. Trans rights & healthcare. Mid-50ish, ex-corporate global wanderer for decades. Now settling in rural Ireland with a special woman. European by heart. Here for the genuine folk and chilled vibe of the Fediverse. Varium et mutabile semper femina. #Tech #Art #StreetArt #WomensArt #Recipes Housekeeping: #noarchive #noindex #nosearch #noAI #NoTagsPub
tech.lgbt
Forgive me, but this is actually a good joke -
Pay attention to the punctuation!
#Math #Maths #Mathematics
More than two thirds of the zeros of the Riemann zeta function lie on the critical line https://lobste.rs/s/8sojbt #math
https://www.anthropic.com/research/riemann-zeta
Moving integer division to floating-point is trivial via @PolyWolf@social.treehouse.systems https://lobste.rs/s/nvmbfe #math
http://marc-b-reynolds.github.io/math/2026/08/10/IntDivByFP.html
The mathematical beauty of hyperbezier curves https://lobste.rs/s/dd80wh #math #visualization
https://linebender.org/blog/hyperbezier/
Adam Coffman
@AdamCoffman@mathstodon.xyz
Mathematician (32V40) some searchable posts are joint work with Pedro the #Math Cat (58K35) personal account: views expressed or boosted here are not those of my department or employer or professional organization or funding agency.
mathstodon.xyz
Pedro the #Math Cat 🐈 having an outdoor minute for #InternationalCatDay and #Caturday
#Cats #CatsOfMastodon
TKSST • seethis.tv 🌈🪐✨
@tksst@fediscience.org
Follow The Kid Should See This for daily posts and science news. Founded in 2011, TKSST features over 8,000 kid-friendly videos for educators and parents sharing smarter, meaningful media at home and in the classroom. Made with 💙 in L.A. Curated by @cosentino (ex-KPCC, IHT, NYT, CBS News). #video #science #scicomm #education #edutech #museums #engineering #story #astronomy #art #design #space #STEM #STEAM #sustainability #animals #wildlife
fediscience.org
💁🏻♀️ NEW: ⚡🧲 #Cambridge #math professor Hannah Fry demonstrates how to build a simple electric #motor using a #battery, #copper wire, #magnets, and paper clips.
Winding wire into a coil creates an electromagnet that repels and attracts the magnet beneath, forcing the coil to spin.
👉 Learn more: https://seethis.tv/post/how-to-make-an-electric-motor-video
#activities #diy #electricity #howto #metal #physics #science #technology #tech #magnetism #engineering #diy #experiment #electromagnets #tksst #video
Andreas Mielke
@mielke@ieji.de
Main research topics: - Strong correlations, Hubbard model - Flat bands, Ferromagnetism - Continuous unitary transformations - Flow equations - Stochastic systems You can find my list of publications on my homepage or on google scholar.
ieji.de
Update of our paper is now available on arXiv!
📄 "The bosonic Hubbard model on a three-dimensional flat band lattice" (arXiv:2604.19703)
🔗 http://arxiv.org/abs/2604.19703
We present a frustration-free bosonic Hubbard model on a 3D flat band lattice, the line graph of the cubic lattice. For the first time (to our knowledge), we observe subextensive ground state entropy in a bosonic lattice model. The result is related to the number of 4-cycle decompositions of the cubic lattice, for which we derive upper and lower bounds.
Co-authored with Leon Haag-Fank.
Looking forward to your thoughts and discussions!
#Physics #Math #CondensedMatter #OpenScience #arXiv
A game made only with sine waves https://lobste.rs/s/rnouen #video #games #math #programming
https://www.youtube.com/watch?v=Qr3VsZYQy4s
Users from the #Netherlands - do you remember, or have you heard of, the mnemonic "Meneer Van Dalen Wacht Op Antwoord"? I have been googling for information about this but am looking for more sources, preferably original textbooks from the 20th century. I can find quite a few references to it but only *after* it was already phased out. Let me know if you remember, are interested and/or can help!
I must confess up front I do not speak #dutch !
#nederland #wiskunde #math #maths #mathematics
José A. Alonso
@Jose_A_Alonso@mathstodon.xyz
Mathematician interested in the study and teaching of computational logic, functional programming (Haskell) and interactive theorem proving (Lean, Isabelle/HOL).
mathstodon.xyz
Un error en el núcleo de Lean aprovechado por una IA para refutar la conjetura de Collatz. ~ Francisco R. Villatoro. https://francis.naukas.com/2026/08/02/un-error-en-el-nucleo-de-lean-aprovechado-por-una-ia-para-refutar-la-conjetura-de-collatz/ #LeanProver #ITP #Math
Paysages Mathématiques
@paysmaths@mathstodon.xyz
Une citation mathématique chaque jour & quelques actualités mathématiques. A mathematical quote every day & some mathematical news. #mathématiques #mathematics #maths #math
mathstodon.xyz
"Before the introduction of the Arabic notation, multiplication was difficult, and the division even of integers called into play the highest mathematical faculties. Probably nothing in the modern world could have more astonished a Greek mathematician than to learn that, under the influence of compulsory education, the whole population of Western Europe [...] could perform the operation of division for the largest numbers." – Alfred North Whitehead (1861–1947)
#quote #mathematics #math #maths
Mathematics Without Mathematicians https://lobste.rs/s/foagiq #math #vibecoding
https://borretti.me/article/mathematics-without-mathematicians
Ten advances in mathematics and theoretical computer science https://lobste.rs/s/n6rg1c #math #vibecoding
https://openai.com/index/ten-advances-in-mathematics/
Oscar Cunningham
@OscarCunningham@mathstodon.xyz
mathstodon.xyz
Can you colour the faces of a dodecahedron black and white so that if you stand on one of the faces you can determine your position and orientation by looking at your face and the adjacent faces? #math #maths #mathematics
Paysages Mathématiques
@paysmaths@mathstodon.xyz
Une citation mathématique chaque jour & quelques actualités mathématiques. A mathematical quote every day & some mathematical news. #mathématiques #mathematics #maths #math
mathstodon.xyz
Theorem of the Day (August 1st, 2026) : The Friedlander–Iwaniec Theorem
Source : Theorem of the Day / Robin Whitty
pdf : https://www.theoremoftheday.org/NumberTheory/FI/TotDFI.pdf
notes : https://www.theoremoftheday.org/Resources/TheoremNotes.htm#202
#mathematics #maths #math #theorem @Theoremoftheday@mathstodon.xyz