Видео с ютуба Open Sets

Intro to Open Sets (with Examples) | Real Analysis

Functional Analysis 3 | Open and Closed Sets

Understanding Open and Closed Sets

The Concept So Much of Modern Math is Built On | Compactness

Metric Spaces 2: Open Sets

Taste of topology: Open Sets

Open sets in a metric space (M,d), with examples, Real Analysis II

Lecture 13: Open and Closed Sets; Coverings; Compactness

Topology Definitions: Closure, Boundary, Interior

402.3B1 Открытые множества в стандартной метрической топологии

Basic Topology 1 | Introduction and Open Sets in Metric Spaces

Introduction to Open and Closed Sets

Math 441 - 3.1 and 3.2 Open and Closed Sets

Infinite Intersection of Open Sets that is Closed Proof

Basic Topology 1 | Introduction and Open Sets in Metric Spaces [dark version]

402.3B5 (Finite) Unions and Intersections of Open Sets

Proof for Unions and Intersections of Open Sets | Real Analysis

Examples of Open Sets in the Standard Topology on the set of Real Numbers

401.8 Непрерывность и открытые множества