• 5.2.2 Definition ⪢⪢
f is continuous at c if and only if for every ε>0 there exists δ>0 such that ⎹x−c⎸<δ ⇒ ⎹f(x)−f(c)⎸<ε.
http://qindex.info/i.php?x=5000

Google ➔ Dictionary ➔ Image ➔ YouGlish