PlanetMath (more info)
 Math for the people, by the people. Sponsor PlanetMath
Encyclopedia | Requests | Forums | Docs | Wiki | Random | RSS  
Login
create new user
name:
pass:
forget your password?
Main Menu
Revision difference : dominant strategy
Version current Version 1
For any player $i$, a strategy $s^*\in S_i$ \emph{weakly dominates} another strategy $s^\prime\in S_i$ if: For any player $i$, a strategy $s^*\in S_i$ \emph{weakly dominates} another strategy $s^\prime\in S_i$ if:
\begin{displaymath} \begin{displaymath}
\forall s_{-i}\in S_{-i}\left[u_i(s^*,s_{-i})\geq u_i(s^\prime,s_{-i})\right] \forall s_{-i}\in S_{-i}\left[u_i(s^*,s_{-i})\geq u_i(s^\prime,s_{-i})\right]
\end{displaymath} \end{displaymath}
(Remember that $S_{-i}$ represents the product of all strategy sets other than $i$'s) (Remember that $S_{-i}$ represents the product of all strategy sets other than $i$'s)
$s^*$ \emph{strongly dominates} $s^\prime$ if: $s^*$ \emph{strongly dominates} $s^\prime$ if:
\begin{displaymath} \begin{displaymath}
\forall s_{-i}\in S_{-i}\left[u_i(s^*,s_{-i})> u_i(s^\prime,s_{-i})\right] \forall s_{-i}\in S_{-i}\left[u_i(s^*,s_{-i})> u_i(s^\prime,s_{-i})\right]
\end{displaymath} \end{displaymath}