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Initial Topology Generated by a Family of Mappings

Topology Generated by a Collection of Sets

Basis for a Topology

Continuous Functions between Topological Spaces

Separation Axioms in Topological Spaces: T0-Spaces and T1-Spaces

Topological Spaces: the Closure of a Set

Topological Spaces: the Interior of a Set

Open Sets and Closed Sets in Metric Spaces

Metric Spaces: Open Balls and Closed Balls

Metric Spaces: Definition and Examples

You are my everything by Santa Esmeralda. Singer: my former professor Hieu Doan; Guitarist: me 😭

The Finite Complement/Cofinite Topology

Topological Spaces: Definition and Examples

Open Sets and Closed Sets in Rn

The Fermat Rule --Part II: Statement

The Fermat Rule--Part III: Proof

The Fermat Rule--Part I: Local Extrema

Intermediate Value Theorem: Proof

Intermediate Value Theorem: Proof --- Part 5

Monotone Convergence Theorem --- Part 2

Monotone Convergence Theorem --- Part 1

Intermediate Value Theorem --- Part 4

Intermediate Value Theorem --- Part 1

Intermediate Value Theorem --- Part 2: Examples