In Chapter 3, we study the decycling number of the cross product P_m×C_n of a path and a cycle.
第三章研究路和圈的叉积图P_m×C_n的消圈数。
参考来源 - 若干乘积图的消圈数·2,447,543篇论文数据，部分数据来源于NoteExpress
或者大多时候，我叫它“叉积。”
Or also called... most of the time I refer to it as "the cross product."
第一单元学得叉积、法向量这些,现在就有用了。
The first unit about cross-products,normal vectors and so on is actually useful now.
为了找到带法向量的面元，我就取这两个的叉积。
To find the surface element together with a normal vector, I would just take the cross-product between these guys.
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