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An Algorithm for the Feedback Vertex Set Problem on a Normal Helly Circular Arc Graph

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Figure

Figure 1. Normal Helly circular-arc model M  and its corresponding graph 1G1 . (a) A normal Helly circular-arc model M ; (b) A normal Helly circular-arc graph 1G1
Figure 3. Normal Helly circular-arc model M2 and its corresponding graph G2. (a) A normal Helly circular-arc model M2; (b) A normal Helly circular-arc graph G2
Figure 4(a)−). Thus, we can obtain an MFVS by adding
Figure 4. Illustration of Lemma 3. (a)

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