The First Step for Mathematical Thinking: Epsilon

Ali
Ali
Oct 8, 2019 · 7 min read

When I close my eyes and go back in time, I see a college student sitting in the back row and looking sad while the professor is standing next to the chalkboard, writing mathematical definitions on it with a chalk. The click, click, click sound was still obvious every time the professor wrote on the blackboard. Then, the student goes into a deep thought when the professor said :