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. 2022 Jun 21;84(8):76. doi: 10.1007/s11538-022-01037-z

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Fig. 9 — Illustration of the proof of Lemma 8 for the case $t (u) > t (q)$ . a When u is a tree node, the head of the reticulation arc (p, r) is moved up. b When u is a reticulation at the top, an LCA y of u and q is a parent of u with $t (y) = t (u)$ , leading to a contradiction to the assumption $t (u) > t (q)$