The factorial is not scaled (example: &quot; fact stack{a#b} &quot; and &quot; fact {a over b} &quot; ) but is oriented using the baseline or centre of the arguments. Brackets always have a fixed size as well.
阶乘符号不按比例变化（例如： &quot; fact stack{a#b} &quot; 和 &quot; fact {a over b} &quot; ），而是自变量的基线或中部对齐。