A coisa linda do dia é ouvir Space Oddity na voz da espetacular Gail Ann — a baixista que trabalhou muitos anos c’ Bowie, Tears for Fears, Concrete Blonde, The The…
A mulher botou [a mim] e à bancada inteira c’ciscão nos olhos e meu coração apertado de sdds do Davi Roberto ❤️
In 1772 an eye operation left Leonhard Euler almost completely blind.
He could still do the mathematics. He could not read it or write it.
So he needed someone. Not a copyist — someone who could follow him.
Euler turned to his old friend Daniel Bernoulli in Basel. Bernoulli knew exactly who to send.
Nicolas Fuss arrived in St Petersburg in May 1773. He was eighteen.
He stayed for the rest of his life.
At Euler’s side he helped push more than 250 papers into print. Not transcription — he developed the ideas, built the tables, worked the examples.
Then Euler died in 1783, and the assistant became the scientist. Academician that same year. Professor of mathematics. And from 1800 until his own death in 1826, permanent secretary of the Imperial Academy of Sciences.
There is a theorem named after him. A sequence of numbers too.
And late in life he did one more thing.
He took the algebra he had learned at Euler’s elbow and built it into a course for the schools of the Russian Empire. Three volumes. Algebra. Then geometry. Then the application of algebra to geometry — trigonometry, conic sections, and the foundations of the calculus.
That trilogy is where Russian school mathematics begins. Kiselev comes after it. The Soviet school comes after Kiselev.
Part I — Algebra, 1820. Four divisions, 59 chapters, 570 sections. From what it means for a letter to stand for a quantity, all the way to the irreducible case of the cubic.
Two hundred years. No English edition. Not once.
Until today.
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If an object moves at a constant speed around a circle, its position projected onto a single axis (like the x-axis) moves back and forth.
Euler's formula eⁱᶿ = cosθ + i sinθ allows physicists to treat an oscillation as a rotation in the complex plane.
Legendre's "gap" refers to a famous unsolved problem in number theory proposed by Adrien-Marie Legendre that states
there is always at least one prime number between any two consecutive perfect squares, n² and (n+1)².
The conjecture has been computationally verified for very large numbers, up to 4 × 10¹⁸, but has not yet been proven mathematically.
🧵 Pues vamos con otro hilo que explique los gestos de este vídeo y el ambiente que se maneja, que veo mucha confusión en esta red social y un poquito de paranoia.
The Potato Paradox:
Fred brings home 100 kg of potatoes, which (being purely mathematical potatoes) consist of 99% water.
He then leaves them outside overnight so that they consist of 98% water.
What is their new weight?
Most people answer ~99kg
Eso que ahora llamamos lawfare no es una obra exclusiva de las policías, los tribunales y las televisiones. Hay también una parte del cuerpo social que repudia el Estado de derecho. Hoy escribo para @publico_es. https://t.co/ExE7IsHoRm
Aclarar q ESTO no es el camino de santiago…es una moda de viaje barato para q niños de cole concertado salgan a buscar a su media naranja..comen de macdonalds…se rien de las tradiciones autoctonas…y pasean una superioridad “españolista” por donde van…eso si..no gastan un duro
Men work more than women. That gap holds today—for men raised by married parents.
But research by @Harvard's Raj Chetty finds it flips for men raised by single parents: they work less "relative to women" especially in "low-income families".
Truly striking figures:👇🏽
Ibai Llanos predijo hace 30 días, punto por punto, la final del Mundial entre España y Argentina.
“Prefiero enfrentarme y reventar a Argentina. Nada me encantaría más. Qué suerte tuviste de que no se juegue la Finalísima. La realidad es que Argentina contra España no toca la bola. La única opción de Argentina para ganar a España es hacer lo de Cabo Verde: empate a cero, Diosito lindo, protégeme, vamos a penaltis y que el Dibu pare. No hay más. Y lo sabes, Abejita. Argentina contra España es 0-0, que Ferran no la meta y el Dibu a ponerse la mano en los huevos en los penaltis. Porque Argentina no va a tocar la bola. Y Messi va a estar dando vueltas y diciendo: ‘Pero si a mí me encantaría jugar con ellos’. Pero Leo, es lo que hay. No puedes. Lamentablemente juegas con Rodrigo de Paul.“
Campo da Leña ❤️ Prenderon as bailas, e os pícaros e as avoas cantaron coma nun serán atávico, vestido de tribo fachendosa da herdanza 🙏 Grazas a @acsondaqui polo convite e a partilla, a Mediarea por compartir e a Xurxo Souto pola obertura sempre emocinante e atinada!!