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# hyperplanes(Arrangement) -- the defining linear forms of an arrangement

- Function: hyperplanes
- Usage:
    `hyperplanes A`
    `toList A`
- Inputs:
  - A, a hyperplane arrangement,
- Outputs:
  - a list, the list of linear forms defining $A$.

## Description

This returns the list of linear forms defining an arrangement. These forms will be elements of the coordinate ring of $A$.

    i1 : A = typeA 3

    o1 = {x  - x , x  - x , x  - x , x  - x , x  - x , x  - x }
           1    2   1    3   1    4   2    3   2    4   3    4

    o1 : Hyperplane Arrangement

    i2 : hyperplanes A

    o2 = {x  - x , x  - x , x  - x , x  - x , x  - x , x  - x }
           1    2   1    3   1    4   2    3   2    4   3    4

    o2 : List

## See also

- matrix(Arrangement) -- make a matrix from the defining equations
- coefficients(Arrangement) -- make a matrix from the coefficients of the defining equations

## Ways to use this method:

- hyperplanes(Arrangement) -- the defining linear forms of an arrangement

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/HyperplaneArrangements.m2:3540:0.