The definition of topological spaces and some interesting examples and counterexamples of topological spaces!
Category: Pure Mathematics
Quick Revision: Topology (Part 0)
A series to quickly revise Topology – Dedicated to my students.
Animation: X – (A ∪ B) = (X – A) ∩ (X – B)
Proof for X – (A U B) = (X – A) ∩ (X – B) using Venn Diagrams / Animation.
Analysis/Topology: Bounded and Totally Bounded Sets
Definitions Bounded set: Let <M,ρ> be a metric space. We say that the subset A of M is bounded if there exists a positive number L such that ρ(x,y)≤L (x,y∈A) (Wikipedia) Diameter of a set: If A is bounded, we define diameter of A (denoted by diam A) as diam A= ρ(x,y). If A is not…
Analysis/Topology: Connected Sets in Metric Spaces
A short discussion on Connected Sets in Metric Spaces with definition, examples, counterexamples, properties and quizzes.
Topology/Analysis: Homeomorphism
Definition If is one-one and onto (1-1 correspondence/bijection) continuous is continuous Then we call a homeomorphism between two metric spaces . The metric space are said to be homeomorphic. Properties and Theorems If f is a homeomorphism between metric spaces , The set G⊂ is open if and only if the image f(G)⊂ is open. The…
Puzzle: Finding a Bounded Continuous Function
Find a continuous, real-valued with its range contained in (0, 1).
Animation: Dihedral Group of Order 8 – Degree 4
Teaching material: Visualization of Dihedral Group of Order 8 – Degree 4. Downloadable.
CoViD-19: Mathematics Takes a Bullet (John H. Conway)
A collection of links to learn more about John H. Conway, who passed away recently.
