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For many years, the control community has witnessed a vast proliferation of research papers devoted to Sliding Mode Control (SMC). The core principle of SMC is the integration of a relay1 into the control loop—an element widely recognized as introducing an infinite-gain operator. More recent variants of SMC incorporate multiple delays modulated using fractional powers of the relay's input signal.
Lizbeth Ovalle fired Mexico into the lead on 38 minutes, pouncing on a blunder by veteran US defender Becky Sauerbrunn before lifting a cool finish over goalkeeper Alyssa Naeher at Dignity Health Sports Park in Carson, California. Substitute Mayra Pelayo-Bernal put the seal on the victory for Mexico with a superb individual goal two minutes into stoppage time, curling a long-range effort beyond Naeher to make it 2-0.
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