D ⏞ the domain = ⏟ is { ⏞ the set ∀ x ⏟ of all x | ⏞ such that x ∈ ℜ ⏟ x is an element of the real number system {\displaystyle {\begin{aligned}\overbrace {D} ^{\text{the domain}}\underbrace {=} _{\text{is}}\overbrace {\{} ^{\text{the set}}\underbrace {\forall x} _{\text{of all x}}\overbrace {|} ^{\text{such that}}\underbrace {x\in \Re } _{\text{x is an element of the real number system}}\end{aligned}}}
