latex - latex 中的 QED 符号

Question

如何输入 QED 符号 - 我想要一个完整的框，而不是像 \qed 给您的那样的空框。 (我没有使用 \begin{proof})

Answer 1

您可以使用\blacksquare ■ :

When creating TeX, Knuth provided the symbol ■ (solid black square), also called by mathematicians tombstone or Halmos symbol (after Paul Halmos, who pioneered its use as an equivalent of Q.E.D.). The tombstone is sometimes open: □ (hollow black square).