在线词典

分类:语言工具
在线词典,是一款在线使用的中英文查词词典。本工具支持查询英文和中文单词及词组的含义,查询效率高、结果丰富,包括单词变体、常用短语、英英释义、同义词、同根词、词语辨析等,是外语学习者必备的在线查词工具。

Extended real number line

查词链接:https://www.dute.org/dict/Extended_real_number_line复制链接
扩展实数线(扩展实数线又称广义实数。在不会混淆时,符号 常简写成。扩展的实数线在研究数学分析,特别是积分时非常有用)
查看英英释义
abstract:
In mathematics, the affinely extended real number system is obtained from the real number system R by adding two elements: +∞ and −∞ (read as positive infinity and negative infinity respectively). The projective extended real number system adds a single object, ∞ (infinity) and makes no distinction between "positive" or "negative" infinity.

网络释义
扩展的实数轴
... expression:表达式; extended real number line:扩展的实数轴; false:假; ...
* 以上查询结果来自于网络,仅供参考。
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