Determine whether each of the following statements is true or false. State the reason.
i) ∅ ∉ ∅
ii) ∅ ⊆ ∅
iii) {∅} ⊆ ∅
i)∀a(a∉∅)⇒∅∉∅ Truei)\forall{a}(a\notin\varnothing)\Rightarrow\varnothing\notin\varnothing\text{ True}i)∀a(a∈/∅)⇒∅∈/∅ True
ii)∀a(∅⊆a)⇒∅⊆∅ Trueii)\forall{a}(\varnothing\sube{a})\Rightarrow\varnothing\sube\varnothing\text{ True}ii)∀a(∅⊆a)⇒∅⊆∅ True
iii)∅ has zero elements, and {∅} has one element.iii)\varnothing\text{ has zero elements, and }\{\varnothing \}\text{ has one element.}iii)∅ has zero elements, and {∅} has one element. ∅⊆∅;\varnothing\sube\varnothing;∅⊆∅;
{∅}⊆∅ is False\{\varnothing \}\sube\varnothing\text{ is False}{∅}⊆∅ is False
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