Covering spaces are a fundamental concept in topology. Some typical examples can be seen in this previous post.
the Lagrange basis function l_i(x):
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"The Nielsen ratings for he speech are in, and Trump's talk-a-thon saw an 11 percent decrease from last year. Donald Trump is really dragging down broadcast television. I mean, if I were CBS I'd cancel him," says Stephen Colbert in the Late Show clip above, winking directly at the camera.
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