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Macaulay2Doc :: Ideal / Function

Ideal / Function -- apply a function to generators of an ideal

Synopsis

Description

The operator / is left associative, which means that w / f / g is interpreted as (w / f) / g. The operator \ is right associative, so g \ f \ w is interpreted as g \ (f \ w). Both operators have parsing precedence lower than that of @@, which means that the previous two expressions are equivalent to w / g @@ f and g @@ f \ w, respectively. See precedence of operators.

i1 : R = ZZ[a..d];
i2 : I = ideal"abc-d3,ab-d-1,a2+b2+c3-14d-3"

                     3                3    2    2
o2 = ideal (a*b*c - d , a*b - d - 1, c  + a  + b  - 14d - 3)

o2 : Ideal of R
i3 : I/size

o3 = {2, 3, 5}

o3 : List
i4 : (f->f+a*b-1)\I

               3                           3    2          2
o4 = {a*b*c - d  + a*b - 1, 2a*b - d - 2, c  + a  + a*b + b  - 14d - 4}

o4 : List
i5 : I/leadTerm/support/set//sum

o5 = set {a, b, c}

o5 : Set