content f -- returns the content of a matrix or polynomial.
The content is the ideal in the base ring generated by the coefficients.
i1 : R = ZZ[x]
o1 = R
o1 : PolynomialRing
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i2 : content(4*x + 6*x^5)
o2 = ideal (6, 4)
o2 : Ideal of ZZ
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i3 : generator oo
o3 = 2
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