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Tag Archives: connected components
Commutative Algebra 14
Basic Open Sets For , let , an open subset of Spec A. Note that . Proposition 1. The collection of over all forms a basis for the topology of . Proof Let be an open subset of Spec A. Suppose … Continue reading
Topology: Topological Groups
This article assumes you know some basic group theory. The motivation here is to consider groups whose underlying operations are continuous with respect to its topology. Definition. A topological group G is a group with an underlying topology such that: the … Continue reading
Posted in Notes
Tagged advanced, compact sets, connected components, groups, homeomorphisms, separation axioms, topological groups, topology
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Topology: Locally Connected and Locally PathConnected Spaces
Locally Connected Spaces Recall that each topological space X is the settheoretic disjoint union of its connected components, but in general (e.g. for X=Q) fails to be the topological disjoint union. The problem is that the connected components in general aren’t open … Continue reading
Topology: PathConnected Spaces
A related notion of connectedness is this: Definition. A path on a topological space X is a continuous map The path is said to connect x and y in X if f(0)=x and f(1)=y. X is said to be pathconnected if any two points … Continue reading
Posted in Notes
Tagged advanced, connected components, connected spaces, pathconnected components, pathconnected spaces, topology
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Topology: Connected Spaces
Let X be a topological space. Recall that if U is a clopen (i.e. open and closed) subset of X, then X is the topological disjoint union of U and X–U. Hence, if we assume X cannot be decomposed any further, there’re no nontrivial clopen subsets of X. … Continue reading