https://en.wikipedia.org/wiki/Abstract_interpretation 해석 하는 방법https://en.wikipedia.org/wiki/Abstract_interpretation 여기에서 n other cases, it is still possible to obtain such an x′ through a (pair-)widening operator,[4] defined as a binary operator ∇:L×L→L which satisfies the following conditions:For all xand y, we have x≤x∇yand y≤x∇y, andFor any ascending sequence (yn′)n≥0, the sequence defined by x0′:=⊥and xn+1′:=xn′∇yn′is ultimately stationary. We can then take yn′=f′(xn′)기호, 설명 다 이해가 안되는데 어떻게 하면 이해할 수 있는지 궁금합니다 .