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This fixes grammar but I changed this sentence, quite a bit and even split it into two. if this isn't what you meant to say I'll change it
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@ -81,7 +81,7 @@ Of course if one is a valid answer, zero can be also. If we want a set of all *b
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Because a set is defined only by the items it contains, the empty set is *unique* — there is no difference between the set that contains zero *balls* and the set that contains zero *numbers*, for instance. Formally, the empty set is marked with the symbol $\varnothing$ (so $B = W = \varnothing$).
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The empty set is a special one, for example, it is a subset of every other set or mathematically speaking, $\forall A \to \varnothing \subseteq A$ ($\forall$ means "for all")
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The empty set has some special properties, for example, it is a subset of every other set. Mathematically speaking, $\forall A \to \varnothing \subseteq A$ ($\forall$ means "for all")
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Functions
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===
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