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

- Function: image
- Usage:
    `image(Phi,"F4")`
    `image(Phi,"MGB")`
- Inputs:
  - Phi, a rational map
  - a string, "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").

## See also

- image(RationalMap) -- closure of the image of a rational map
- image(RationalMap,ZZ) -- closure of the image of a rational map
- groebnerBasis -- Gröbner basis, as a matrix

## Ways to use this method:

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

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/Cremona/documentation.m2:681:0.