next | previous | forward | backward | up | top | index | toc | Macaulay2 website
Macaulay2Doc > substitution and maps between rings > graphIdeal(RingMap)

graphIdeal(RingMap) -- the ideal of the graph of the regular map corresponding to a ring map

Synopsis

Description

i1 : R = QQ[x,y]

o1 = R

o1 : PolynomialRing
i2 : S = QQ[s,t,u]

o2 = S

o2 : PolynomialRing
i3 : f = map(R,S,{x^2,x*y,y^2})

               2        2
o3 = map(R,S,{x , x*y, y })

o3 : RingMap R <--- S
i4 : graphIdeal f

               2                       2
o4 = ideal (- p  + p , - p p  + p , - p  + p )
               0    2     0 1    3     1    4

o4 : Ideal of QQ[p ..p ]
                  0   4

See also