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学生要深入理解课本中极值点、极值的定义.在不等式恒成立问题中,针对“存在区间内某点处或者区间端点处,函数值为零”的一类问题,可以用极值点、极值的知识进行解决,从而找到突破口. 相似文献
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The classic rare-earth tritelluride provides an ideal platform to study the strong correlation state owing to its stable structures and abundance of orders. Here we report the observation of an undiscovered charge density wave(CDW) in LaTe3 under 4.2 K, the transition temperature of the CDW states is fitted to be 35 K,and confirmed by the evanishment of this CDW at 77 K via using temperature-dependent scanning tunneling microscope/spectroscopy. The coexistence of these CDWs is confirm... 相似文献
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