diff -r 26983135fd6d -r 57143c09dc20 doc/groups.dox
--- a/doc/groups.dox	Wed Nov 14 17:53:08 2007 +0000
+++ b/doc/groups.dox	Sat Nov 17 20:58:11 2007 +0000
@@ -223,8 +223,27 @@
 This group describes the algorithms for finding maximum flows and
 feasible circulations.
 
-\image html flow.png
-\image latex flow.eps "Graph flow" width=\textwidth
+The maximum flow problem is to find a flow between a single-source and
+single-target that is maximum. Formally, there is \f$G=(V,A)\f$
+directed graph, an \f$c_a:A\rightarrow\mathbf{R}^+_0\f$ capacity
+function and given \f$s, t \in V\f$ source and target node. The
+maximum flow is the solution of the next optimization problem:
+
+\f[ 0 \le f_a \le c_a \f]
+\f[ \sum_{v\in\delta^{-}(u)}f_{vu}=\sum_{v\in\delta^{+}(u)}f_{uv} \quad u \in V \setminus \{s,t\}\f]
+\f[ \max \sum_{v\in\delta^{+}(s)}f_{uv} - \sum_{v\in\delta^{-}(s)}f_{vu}\f]
+
+The lemon contains several algorithms for solve maximum flow problems:
+- \ref lemon::EdmondsKarp "Edmonds-Karp" 
+- \ref lemon::Preflow "Goldberg's Preflow algorithm"
+- \ref lemon::DinitzSleatorTarjan "Dinitz's blocking flow algorithm with dynamic tree"
+- \ref lemon::GoldbergTarjan "Preflow algorithm with dynamic trees"
+
+In most cases the \ref lemon::Preflow "preflow" algorithm provides the
+fastest method to compute the maximum flow. All impelementations
+provides functions for query the minimum cut, which is the dual linear
+programming probelm of the maximum flow.
+
 */
 
 /**