Editing Stream function (section)

=== Summary of properties ===
The basic properties of two-dimensional stream functions can be summarized as follows:
# The ''x''- and ''y''-components of the flow velocity at a given point are given by the [[partial derivative]]s of the stream function at that point.
# The value of the stream function is constant along every [[Streamlines, streaklines, and pathlines|streamline]] (streamlines represent the trajectories of particles in steady flow). That is, in two dimensions each streamline is a [[level curve]] of the stream function.
# The difference between the stream function values at any two points gives the volumetric flux through the vertical surface that connects the two points.