Using a change of numeraire (see Chapter 7), demonstrate that, in the case where S1 and S2

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Using a change of numeraire (see Chapter 7), demonstrate that, in the case where S1 and S2 follow geometric Brownian motions with constant volatility, and zero dividends, the undiscounted risk-neutral expectation of the outperformance P = max(S1, S2) is given by:

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