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Paul Erdős was one of the most prolific mathematicians of the 20th century, writing nearly 1,500 papers while living out of a suitcase with no permanent home. He could struggle with ordinary tasks ...

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As the SAT nears its 100th anniversary, here's a look at how the test has changed since 1926 and how scores on both the SAT and ACT have shifted over time.

Abstract: In this work, we focus on studying the differentiable relaxations of several linear regression problems, where the original formulations are usually both nonsmooth with one nonconvex term.