Nesting groups within each other is relatively problem-free. In the formula hat &quot; {a + b} &quot; the &quot; hat &quot; is displayed simply over the centre of &quot; {a + b} &quot; . Also, &quot; colour red lceil a rceil &quot; and &quot; grave hat langle x * y rangle &quot; work as expected. The result of the latter can be compared to &quot; grave {hat langle x * y rangle}. &quot; These attributes do not compete, but rather can be combined. This differs slightly for competing or mutually influencing attributes. This is often the case with font attributes.
将组彼此进行嵌套，相对而言不容易出现问题。对于公式 hat &quot; {a + b} &quot; ，其中的 &quot; hat &quot; 会显示在 &quot; {a + b} &quot; 中央的正上方。此外， &quot; color red lceil a rceil &quot; 和 &quot; grave hat langle x * y rangle &quot; 也会达到预期效果。后者的结果相当于 &quot; grave {hat langle x * y rangle} &quot; 。这些属性不会冲突，而且可以进行组合。