next | previous | forward | backward | up | top | index | toc | Macaulay2 web site
Macaulay2Doc :: isField

isField -- whether something is a field

Synopsis

Description

This function recognizes basic fields, Galois fields and fraction fields.
i1 : isField QQ

o1 = true
i2 : isField CC_53

o2 = true
i3 : isField GF(2,3)

o3 = true
i4 : isField(frac(QQ[x,y]))

o4 = true
This function will not recognize other rings as fields.
i5 : R = QQ[x]/(x^2+1)

o5 = R

o5 : QuotientRing
i6 : isUnit x

o6 = true
i7 : isField R

o7 = false
i8 : F = toField R

o8 = F

o8 : PolynomialRing
i9 : isField F

o9 = true

See also

Ways to use isField :