Figure 4From: Efficient algorithms for reconciling gene trees and species networks via duplication and loss eventsAn illustration for the proof of Lemma 7. In this example: L = {l1, l2, l3, l4}, Q = {q1, q2, q3}, L* = {l1, l3, l4}, L3 = {l4}, L2 = {l3}, and L1 = ∅. For i = 1, let l(q1) = l3; thus, we have c(1) = 2 and the path p1 starts from q1, passes through q 1 ″ , b1 to l3, while the path p 1 ′ starts from q2, passes through q 2 ″ , b1 to l3. In this case, we have h1 = b1. For i = 2, let l(q2) = l3; thus we have c(2) = 3 and the path p2 starts from q2, passes through q 2 ″ , b1, b2, h2 to l4, while the path p 2 ′ starts from q3 passes through q 3 ″ to l4. Let x be a node in M N ′ ( L ) , then x is also in M N ″ ( L ) where N" is obtained from N' by removing all edges (a i , b i ).Back to article page