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Evolutionary Game Theory

Replicator dynamics on 2×2 games — phase portraits and strategy evolution

Game Selection

Payoff Matrix (row=A, col=B):
Strategy A
Strategy B
A
B
Prisoner's Dilemma: defection dominates. ESS at p(A)=0 (all defect) regardless of starting condition.
0.50

Phase Portrait (frequency of A)

Fixed points shown as circles (open=unstable, filled=stable). Click to start trajectory from that frequency.

Strategy Frequencies Over Time