I'm Sean. I'll make a more complete user page sometime in the future.
My philosophy on life: ∀ ε ∈ R > 0 , ∃ δ ∈ R > 0 {\displaystyle \forall \varepsilon \in \mathbb {R} _{>0},\exists \delta \in \mathbb {R} _{>0}} such that ∀ x ∈ R , | x − a | < δ → | f ( x ) − L | < ε {\displaystyle \forall x\in \mathbb {R} ,\vert x-a\vert <\delta \rightarrow \vert f(x)-L\vert <\varepsilon }