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/* 北极甜虾公众号 · 讲义版样式（集合论系列《数到无穷之后》，第 10 期起）
   与 base.css（宣纸版）并存：wechat.assemble(..., base="base_cantor.css") 时启用。
   气质：十九世纪数学讲义。象牙白纸、普鲁士蓝、旧金；版头是一块深蓝夜色；定理用楷体，节号用 §。
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/* 定义、定理、证明、旁注 */
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/* 观点、方法框、留言 */
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/* 参考资料、署名 */
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/* 系列导航：五讲的位置 */
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