数学
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The study or use of numbers and shapes to calculate, represent, or describe things.
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方法 Negative Cardinality
A mathematical set property of having less than 0 elements (Just like antimatter in Physics.)
企画 Quantitative Cardinality Sets Project
Brining sets with quantifiabiable cardinality into common use in mathematics.
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Wikipedia:Mathematics
I'm thinking that our interests should extract the most useful info from the Wikipedia here, for someone understand the subject domain, tweet-like wikipedia articles possible?
