Inyuki, 
负元素个数性
少于0个元素的数学集合属性（就像物理学中的反物质。）
负数和虚数的发明被证明对数学很有用。然而，集合运算并没有少于0个元素的概念。我们到达空集 {}，然后就停止了，但为什么要这样呢？想象一个属性：减去一个不在集合中的元素，会产生一个消灭该元素的潜力。这种潜力可以标记为带有撇号的元素。即，{1,2',2} = {1}。
这个想法是受“世界上最独特的俱乐部”的启发，在思考超级排他性的时候。
来自：Inyuki 从 HalfBakery。
github.com: "Goals are Just Assets"
Goals are just assets with negative sign of carnality, so such theory would be useful for formalizing goal pursuit...
负基数是某种东西的赤字，一项尚未完成的任务。它与顺序、然后和时间有关。非常有意思
Negative cardinality is deficit of something, a task yet to be done. It has to do with sequence, then, and time. Really interesting
是的，也许它可以简化会计，或者它甚至可以帮助使目标追求更加想象，因为所有形式化为一组...... /github.com/wefindx/asterisk/blob/master/docs/2016-09-28_Goals_are_Just_Assets.md
Yeah, perhaps it could simplify accounting, or maybe, it could even help make goal-pursuit more imaginary, as everything that's formalized as a set of sets of ... of sets, could suddenly have that imaginary component ("goals are just imaginary assets").