What concept did Weierstrass formalize the definition of?
Natural number
Derivative
Continuity of a function
Pythagorean theorem
Answer
Weierstrass introduced the epsilon-delta definition of continuity in 1870, which is still in use today. The definition states that a function is continuous at a point if for any ε > 0, there exists a δ > 0 such that if |x − x0| < δ, then |f(x) − f(x0)| < ε.
Discovering the Genius: The Karl Weierstrass Quiz
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