Problemas de Matemáticas y Física

Problemas resueltos de Física y Matemáticas y, de vez en cuando, algún que otro relato de ciencia-ficción.

[Víctor Guisado Muñoz @VictorGuisadoM]

¿Realmente te crees más listo que un gato? LA VENGANZA DE ZANAHORIO, un nuevo relato sobre los límites de lo posible... https://t.co/jmFFEyLdkS

[Profe de Tecno en Extinció @TecnoEnExtincio]

Visca la llei RD 486/1997 !!!!!!

[Escèptics al Pub @esceptics]

Todos invitados al 107 eeepBCN: Ataques Corsarios, Barcelona y Don Quijote https://t.co/6DVxNdQZ5g #Meetup via @Meetup

[Joan Anton Català Amigó @estelsiplanetes]

Mireu què es prepara en el cel.
Aquesta simulació correspon al 30 d'aquest mes de maig, al vespre, quan es faci fosc i mirant cap a l'oest.
#miremelcel

[Joan Anton Català Amigó @estelsiplanetes]

A la població d'Utqiagvik (Alaska), ahir el Sol no es va amagar en tot el dia, i no ho farà fins el 2 d'agost.

[Àlex Hinojo @AlexHinojo]

Molta gent em pregunta per què segueixo editant la @Viquipedia ara que tothom fa servir Gemini, GPT o similars.

Jo ho veig així: la IA és com un barri ple de llibreries maques. Són elegants, maques i convenients, però poden tancar en qualsevol moment, convertir-se en espais de pagament o canviar el seu model de negoci d'un dia per l'altre.

La Viquipèdia és com la biblioteca pública del barri. És l'escala universal cap al coneixement i la garantia que l'accés a la informació continuarà sent lliure i gratuït per a tothom, independentment de la seva butxaca i la seva potència de càlcul. I ho serà en el seu idioma i amb el seu context cultural.

L'IA pot ser la interfície, però nosaltres en som l'ànima. Si no documentem el nostre món en la nostra llengua, qui ho farà? ✍️🌍

Som-hi

[Javier García @javier110]

@ProblemasdeMat1 sorpresa!!

[Problemas de Matemáticas y Física @ProblemasdeMat1]

@javier110 Y todavía tan y tan actual XD Un abrazo, Javi :)

[Andreu Navarra @AndreuNavarra]

Comencen a arribar els 90.000 ordinadors que substituiran els 90.000 ordinadors anteriors, que caldrà configurar, etc...
Ningú no dirà res?
Ningú no farà res?

[Ihtesham Ali @ihtesham2005]

An MIT professor taught the same math course for 62 years, and the day he retired, students from every country on earth showed up online to watch him give his final lecture.

I opened the playlist at 2am and ended up watching three of them back to back.

His name is Gilbert Strang. The course is MIT 18.06 Linear Algebra.

Every machine learning engineer, every data scientist, every quant, every self-taught programmer who actually understands how AI works learned the math from this one man. Most of them never set foot on MIT's campus. They just opened a free playlist on YouTube and let him teach.

Here's the story almost nobody tells you.

Strang joined the MIT math faculty in 1962. He retired in 2023. That is 61 years of standing at the same chalkboard teaching the same subject to 18-year-olds.

The interesting part is what he did when MIT launched OpenCourseWare in 2002. Most professors were skeptical. They worried that putting their lectures online would make their classrooms irrelevant. Strang did not hesitate. He said his life's mission was to open mathematics to students everywhere. He filmed every lecture and gave it away.

The decision quietly changed how the world learns math.

For decades linear algebra was taught the wrong way. Professors started with abstract vector spaces and proofs about field axioms. Students drowned in the abstraction. Most never recovered. They walked out believing they were bad at math when they had simply been taught in an order that nobody's brain is built to absorb.

Strang inverted the entire curriculum.

He started with matrix multiplication. Something you can write down on paper. Something you can compute by hand. Something you can see. Then he showed his students that everything else in linear algebra eigenvectors, singular value decomposition, orthogonality, the four fundamental subspaces was just a different lens for understanding what the matrix was actually doing under the hood.

His rule was strict. If a student could not explain a concept using a concrete 3 by 3 example, that student did not actually understand the concept yet. The abstraction was supposed to come last, not first. The intuition was the foundation. The proofs were just confirmation that the intuition was correct.

The second thing Strang changed was the classroom itself. He said please and thank you to his students. Every single lecture. He paused mid-derivation to ask "am I OK?" to check if anyone was lost. He never used the word "obviously" or "trivially" because he knew exactly what those words do to a student who is one step behind. He treated 19-year-olds learning math for the first time the way he treated his own colleagues. With patience. With respect. With the assumption that they belonged in the room.

For 62 years.

The result is something that has never happened in the history of education. A single math professor became the default teacher of his subject for the entire planet.

Universities in India, China, Brazil, Nigeria, every country with a computer science department, started telling their own students to just watch Strang's lectures. The University of Illinois revised its linear algebra course to do almost no in-person lecturing. The reason was honest. The professor said they could not compete with the videos.

His final lecture was in May 2023.

The auditorium was packed with students who had never met him before. He walked to the chalkboard, taught for an hour, and at the end the entire room stood and applauded. He looked confused for a moment, like he genuinely did not understand why they were cheering. Then he smiled and waved them off and walked out.

His written comment under the YouTube video of that final lecture was four sentences long. He said teaching had been a wonderful life. He said he was grateful to everyone who saw the importance of linear algebra. He said the movement of teaching it well would continue because it was right.

That was it. No book promotion. No farewell speech. No legacy management.

The man whose teaching is the foundation of modern AI just thanked the audience and went home.

20 million views. Zero ego. The entire engine of the AI revolution sits on top of math that millions of people learned for free from one quiet professor in Cambridge.

The course is still on MIT OpenCourseWare. Every lecture, every problem set, every exam, every solution. Free.

The most important math course of the 21st century is sitting one click away from you. Most people will never open it.

[Víctor Guisado Muñoz @VictorGuisadoM]

Ya está publicado completo mi relato "Soledad de los vigías en invierno". Enlace a la cuarta parte: https://t.co/ghdfLXkZW0

[Víctor Guisado Muñoz @VictorGuisadoM]

Ya está publicado completo mi relato "Soledad de los vigías en invierno". Enlace a la tercera parte: https://t.co/9ZkKnkO9m7

[Víctor Guisado Muñoz @VictorGuisadoM]

Ya está publicado completo mi relato "Soledad de los vigías en invierno". Enlace a la segunda parte: https://t.co/Q342eiap1s

[Víctor Guisado Muñoz @VictorGuisadoM]

Ya está publicado completo mi relato "Soledad de los vigías en invierno". Enlace a la primera parte: https://t.co/gLJzAth7JO

[Víctor Guisado Muñoz @VictorGuisadoM]

Cuarta y última parte de mi relato "Soledad de los vigías en invierno": https://t.co/ghdfLXkZW0 #relato #literatura #cienciaficción #sicifi #misterio

[Profe de Tecno en Extinció @TecnoEnExtincio]

@mpulidogu Quin carallot estàs fet. Ets tan ruc i tan menjagambes i llepacalces a la jefa, que fas el ridícul en públic. Les teves classes deuen ser del tot una vergonya plena d'enganys, manipulacions i proselitisme socialista.

[Víctor Guisado Muñoz @VictorGuisadoM]

Primera parte de mi relato "Soledad de los vigías en invierno" https://t.co/gLJzAth7JO

[Víctor Guisado Muñoz @VictorGuisadoM]

El último ruido

[Víctor Guisado Muñoz @VictorGuisadoM]

Segunda parte (y final) de mi relato "El último ruido": https://t.co/evuz0SKwJR

[Víctor Guisado Muñoz @VictorGuisadoM]

Mi relato de ciencia ficción "El último ruido", primera parte. https://t.co/pWTTZlqa4Q