landscape as : $$L(e, F) = \left\{ \begin{array}{ll}
            1 & \mbox{if } e = f,\\
            0 & \mbox{if } e = r,\\
        \end{array}
        \right.$$ and $$L(e, R) = \left\{ \begin{array}{ll}
                1 & \mbox{if } e = f,\\
                1 & \mbox{if } e = r.\\
            \end{array}
        \right.$$

    When the earth seems flat ($f$) the earth could be flat or round (because round surfaces can appear flat when observed up close), so both concepts ($F$ and $R$) are likely. However, when the earth seems round only the concept that the earth is round is likely.

-   Let us consider again the example of color developed above (Fig. \[fig:example\_color\]), where $E$ is the set of all wavelengths of the visible spectrum and $\mathcal{C}$ is the set of colors. Moreover, let us consider that it does not make sense to discriminate between colors. In that case, we would define the likelihood landscape as $L(e,c) = 1$ for all $(e, c) \in \mathcal{E} \times \mathcal{C} \setminus\{0\}$.

Credibility
-----------

In addition to the population structure $\Gamma$ from Definition \[def:Gamma\], the influence of individuals on each other also depends on their *credibility*, through the credibility matrix $C$. The level of credibility attributed to an individual by another 