1869 G. A. Walton & E. N. L. Walton 101 To denote ‘greatest common factor’, use G. C. F.
1954 27 274 The g.c.f. of these two expressions must divide their sum and difference.
2004 W. M. Kelley xi. 142 Once you've found the GCF of the polynomial, you can factor that polynomial.