Fig. 1
From: The topology of the directed clique complex as a network invariant
Variation of the Euler characteristic during the neural network evolution. a Differences of the Euler characteristic in subsequent steps of the simulation over time (blue curve) compared to the pruning level (red curve), i.e. the number of pruned connections. Notice that the two curves overlap almost completely, then the variation of the Euler characteristic is a precise measure of the changes in the topology due to the pruning activity. b Evolution of the Euler characteristic of the active sub-network (blue curve) compared to the number of active units during the network evolution (red curve). Notice that the two curves are negatively correlated