I was reading the book Hyperspace by Michio Kaku when I read about simply connected space and multiply connected space. I just tried searching the answer using Wikipedia but I wasn't able to understand the definition.
2026-04-02 14:04:47.1775138687
What is a simply connected space and a multiply connected space?
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A space is simply connected if any two points in the space can be joined by a continuous path lying in the space, and every continuous loop in the space can be continuously contracted to a point.
For example, a circle fails to be simply connected, whereas a sphere is simply connected. Roughly speaking, a space is simply connected if there are no "tunnels" or "punctures" in it.