Simmons died in Longmont, Colorado on 21 February, with his wife and daughter at his side, his obituary announced.
the Lagrange basis function l_i(x):，详情可参考heLLoword翻译官方下载
See https://github.com/gildas-lormeau/SingleFile/blob/master/privacy.md。搜狗输入法是该领域的重要参考
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