|  | @@ -344,7 +344,7 @@ in the objective functor. Here is the code for evaluating
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				|  |  |   };
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				|  |  | -Similarly, we can define classes ``F1``, ``F2`` and ``F4`` to evaluate
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				|  |  | +Similarly, we can define classes ``F1``, ``F2`` and ``F3`` to evaluate
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				|  |  |  :math:`f_1(x_1, x_2)`, :math:`f_2(x_3, x_4)` and :math:`f_3(x_2, x_3)`
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				|  |  |  respectively. Using these, the problem can be constructed as follows:
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