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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)。 黑板粗体一般是在数学中拿来代表一些数字的集合（比如自然数 N \mathbb {N} ，整数 Z \mathbb {Z} ，复数 C \mathbb {C} ），标准的AMS黑板粗体实际上. Blackboard还有一个自带论文查重的功能，就是你每次Submit完一个作业，大约5分钟后重新进入Submission的页面，Similarity就会出现在View的左边，如果是绿灯就安全啦~ （如果是黄灯甚至红灯，说明你引用太多或有抄袭的嫌疑，你就需要删减一下引用的部分再Resubmit。 Young authors (and some older ones) seem to prefer blackboard bold to plain bold for the standard number systems (and/or they pick it up by osmosis on web sites such as this one), and the notation is now entrenched. Does anyone know a good resource (preferably pictures) that illustrates a conventional way to write the special sets symbols, i.e
4、12年有消息说，blackboard收购了两家在线开放学习平台的公司，开始研发MOOC开放平台，12年7月上线； 5、我了一下美股，blackboard（代码BBBB）在2012年股票交易突然就停了，不知道是什么原因是退市、并购还是什么原因？ 第一， blackboard系统 2003、2003年的时候已进入中国，是通过教育网下面一个公司动作的，推了一段时间，就停了。 第二，国内很多高校都自己采购或开发了自己的相关系统。 第三，也是最关键的，类似的东东，跟中国高校的教学实际相差太远，属于水土不服型儿. 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 $\\bbb p$ i am familiar with symbo.
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