Android 性能迎来提升：内核引入 AutoFDO 普惠所有 15-16 设备

小学数学素养的高低对学生以后的发展有非常重要的影响,因此新课标要求小学数学教师必须充分发挥学生在教学活动中的主体作用,以全面提升数学课堂的有效性,不断增强小学生的数学能力。本文对小学数学课堂有效性的内涵进行了深入解读,并全面分析了当前小学数学课堂教学的现状,进而探讨了提升小学数学课堂有效性的策略,以供相关人员参考。

In this note we present examples of complex algebraic surfaces with canonical maps of degree $12$, $13$, $15$, $16$ and $18$. They are constructed as quotients of a product of two curves of genus $10$ and $19$ using certain non-free actions of the group $S_3\times \mathbb Z_3^2$. To our knowledge there are no other examples in literature of surfaces with canonical map of degree $13$, $15$ and $18$.