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Chapter 3
4 Courses

Function Limits and Continuity

Extend the concept of limits from sequences to functions. Master the ε-δ definition, understand continuity in depth, and prove fundamental theorems that form the backbone of calculus and real analysis.

15-19 hours total
Foundation for derivatives
Full proofs included
Chapter Highlights
Rigorous ε-δ definition of function limits with Heine's sequential criterion
Complete classification of discontinuities with worked examples
Intermediate Value Theorem with root-finding applications
Extreme Value Theorem and uniform continuity on closed intervals
Prerequisites
Complete Chapter 2 before starting this chapter
Sequences and ε-N Definition (CALC-2.1)
Properties of Sequence Limits (CALC-2.2)
Convergence Theorems (CALC-2.3)
Subsequences and Completeness (CALC-2.4)
Key Mathematicians

Augustin-Louis Cauchy

Rigorous limit and continuity definitions

Karl Weierstrass

ε-δ formalization, uniform continuity

Eduard Heine

Sequential characterization of limits

Bernard Bolzano

Intermediate Value Theorem