左箭头 \leftarrow 右箭头 \rightarrow 上箭头 \uparrow 上圆圈(度数) \circ 例 text (2,3,'\alpha_2^\beta') 注: 可用 {}把须放在一起的括起来 ^ {supeerstring}——进行上标文本的注释 _. \documentclass{article} \usepackage{amsmath} \usepackage{accents} \newlength{\dhatheight} \newcommand{\doublehat}[1]{%. 首先是180这个数字后面的度数符号,在刘海洋老师的《latex入门》的第39页专门花了一小段来讲这个角度符号,他建议使用 $^\circ$ 来打这个角度符号。 这里的 \circ 其实是表示函数复.
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