# image(RationalMap,String) -- closure of the image of a rational map using the F4 algorithm (experimental)

## Synopsis

• Function: image
• Usage:
image(Phi,"F4")
image(Phi,"MGB")
• Inputs:
• Phi,
• , "F4" or "MGB"
• Outputs:
• the ideal defining the closure of the image of Phi; the calculation passes through groebnerBasis(...,Strategy=>"F4") or groebnerBasis(...,Strategy=>"MGB").