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In the first post of the thread cardinal number subtraction, cardinal number subtraction there is a symbol for some kind of set which looks like this: 一、黑板粗体 (blackboard bold) \mathbb实际上指的是 黑板粗体 (blackboard bold),在原先的字母基础上多了一些特定的线条,所以有时候也被称为 双线体 (double struck)。 · does anyone know a good resource (preferably pictures) that illustrates a conventional way to write the special sets symbols, i. e. · blackboard bold, bold, fraktur, and reserved variable. Ask question asked 10 years, modified 7 years, · 该字体称为 blackboard bold(黑板粗体),可使用 \mathbb{} 命令打出。 p. s. $\bbb p$ i am familiar with symbo. $\mathbb{n,z,q,r,c}$ etc. , by hand? Χρησιμες συνδεσεις κατάλογος με διαδικτυακά μαθήματα blackboard βlackboard self service teams σύντομος οδηγός χρήσης microsoft teams προσφατες απαντησεις e- exams!