In topology, a wedge sum is a specific way of combining two or more topological spaces into a single space. The construction involves taking a collection of spaces and identifying a single point from each space. The basic idea is as follows: 1. **Choose Spaces**: Consider two or more topological spaces, say \(X_1, X_2, \ldots, X_n\).
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The wedge sum of pointed spaces identifies all their basepoints. In particular, a wedge of circles has first homology .