![]() Perelman’s proof had some small gaps, and drew directly from research by American mathematician Richard Hamilton. After some revisions and developments, the conjecture took the form of “Every simply-connected, closed 3-manifold is homeomorphic to S^3,” which essentially says “the simplest 4D shape is the 4D equivalent of a sphere.”Ī century later, in 2003, a Russian mathematician named Grigori Perelman posted a proof of Poincaré’s conjecture on the modern open math forum arXiv. Poincaré then went up to 4-dimensional stuff, and asked an equivalent question. In some significant sense, a ball is the simplest of these shapes. For shapes in 3D space, like a ball or a donut, it wasn’t very hard to classify them all. Here’s the idea: Topologists want mathematical tools for distinguishing abstract shapes. Henri Poincaré was a French mathematician who, around the turn of the 20th century, did foundational work in what we now call topology. Today, they’re all still unsolved, except for the Poincaré conjecture. In 2000, the Clay Mathematics Institute, a non-profit dedicated to “increasing and disseminating mathematical knowledge,” asked the world to solve seven math problems and offered $1,000,000 to anybody who could crack even one. ![]() This Math Puzzle Stumped MIT Applicants on the 1876 Entrance Exam.A Mathematician Has Finally Solved the Infamous Goat Problem.Now He’s Solving the World’s Hardest Equations. This Inmate Used Solitary Confinement to Learn Math.So here are nine more brutally difficult math problems that once seemed impossible, until mathematicians found a breakthrough. That’s the beauty of math: There’s always an answer for everything, even if takes years, decades, or even centuries to find it. That turned out to be much harder-as in, no one was able to solve for those integers for 65 years until a supercomputer finally came up with the solution to 42. But what about the integers for x, y, and z so that x³+y³+z³=42? Can you think of the integers for x, y, and z so that x³+y³+z³=8? Sure. It’s called a Diophantine Equation, and it’s sometimes known as the “summing of three cubes”: Find x, y, and z such that x³+y³+z³=k, for each k from one to 100. In 2019, mathematicians finally solved a hard math puzzle that had stumped them for decades.
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