Circle of confusion

• In geometry, a simple path is a simple curve, namely, a continuous injective function from an interval in the set of real numbers $\mathbb{ℝ}$ to ${\mathbb{ℝ}}^n$ or more generally to a metric space or a topological space.
• In graph theory a simple path is a path in a graph which does not have repeating vertices. See path (graph theory).

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