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#equations

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Bonjour à tous ! 👋

Je partage une petite #application interactive sans prétention autour de la résolution d'#équations simples au regard de l'arrivée du pré-algèbre dans les nouveaux #programmes du #cycle3. 📖👀

🍎 Trouve sa valeur ! ⚖️
lmdbt.forge.apps.education.fr/

Elle permet aux élèves de manipuler une balance avec des fruits (emojis 🍌🍇🥕…) représentant l'inconnue.
Ils peuvent enlever ou diviser chaque côté de la balance pour garder l'équilibre et trouver la bonne valeur 🎯

Disponible sur #LaForgeEdu
docs.forge.apps.education.fr d' @apps

⚠️ La peinture est fraîche ⚠️

Bonne soirée et bon weekend ! 😉

"In the paper, the researchers suggest they have figured out how to unify three physical theories that explain the motion of fluids. [...] This breakthrough won’t change the theories themselves, but it mathematically justifies them and strengthens our confidence that the equations work in the way we think they do."

scientificamerican.com/article

Scientific American · Lofty Math Problem Called Hilbert’s Sixth Closer to Being SolvedBy Jack Murtagh

A cycloidal pendulum - one suspended from the cusp of an inverted cycloid - is isochronous, meaning its period is constant regardless of the amplitude of the swing. Please find the proof using energy methods: Lagrange's equations (in the images attached to the reply).

Background:
The standard pendulum period of \(2\pi\sqrt{L/g}\) or frequency \(\sqrt{g/L}\) holds only for small oscillations. The frequency becomes smaller as the amplitude grows. If you want to build a pendulum whose frequency is independent of the amplitude, you should hang it from the cusp of a cycloid of a certain size, as shown in the gif. As the string wraps partially around the cycloid, the effect decreases the length of the string in the air, increasing the frequency back up to a constant value.

In more detail:
A cycloid is the path taken by a point on the rim of a rolling wheel. The upside-down cycloid in the gif can be parameterized by \((x, y)=R(\theta-\sin\theta, -1+\cos\theta)\), where \(\theta=0\) corresponds to the cusp. Consider a pendulum of length \(L=4R\) hanging from the cusp, and let \(\alpha\) be the angle the string makes with the vertical, as shown (in the proof).

"[A]bout a decade ago, I was helping to refine a system for fabricating chips using extreme ultraviolet (EUV) light.
[...]
I realized that many aspects of this process have intriguing similarities to what happens during a supernova: a sudden explosion, an expanding cloud of plasma debris, and a shock wave that slams into a thin hydrogen environment. (Interstellar material consists mostly of hydrogen.)"

spectrum.ieee.org/euv-light-so

IEEE Spectrum · The Tiny Star Explosions Powering Moore’s LawBy Jayson Stewart

Ich bin dabei für meine Kids die Aufschriebe der 9. Klasse für die Prüfungen in der 10. etwas schöner darzustellen, zum besseren Lernen.
Aktuell sind wir bei Grundlagen der Elektrotechnik und das Problem, wie so oft, ist das Darstellen in Aufschrieben und Notizen von Formeln.
Klar gibt es Formeleditoren, aber die sind alle etwas umständlich zu handhaben, also lasse ich sie mir einfach von ChatGPT darstellen und füge sie in das Dokument ein.
#chatgpt #equations #formeln #notizenapp

Les #équations peuvent produire des dessins. 🥳
Par exemple, voici une équation d'un col de vêtement : |y| + |x²+sin(y)-1| = 1

Si vous voulez l'essayer dans G'MIC -> Rendering -> Equation Plot [Implicit], il faut la traduire : abs(y) + abs(x^2+sin(y)-1) - 1

Vous voudrez peut-être retourner l'image : abs(-y) + abs(x^2+sin(-y)-1) - 1

Vous voudrez peut-être faire un zoom "×2", il faut faire "/2" pour x et pour y : abs(-y/2) + abs(x^2/4+sin(-y/2)-1) - 1

Amusez-vous bien 🙂

So I am using an equation editor for the first time in years, because a lot of word processors *still* don't properly support equations (i.e. they don't support LaTeX for real).

Equation editors still suck. Equation editors still connect parts of the equations (that shouldn't be connected) so that you can't edit them and minor mistakes require a full redo.

How is this the case in 2024!?!