Figure 5From: Selection for altruism through random drift in variable size populations Tensor reindexation. (a) To each 2 d index ( m,n), a new 1 d index k is associated by scanning sequentially the anti-diagonal lines. ( b) The re-indexation transforms the tensorial equation (8) into a normal linear system W k ′ k π k ′ = B k , where πk are the unknowns.Back to article page