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Group Theory 5, 383–401, 2002. [9] L´aszl´o Babai, P´eter P. P´ alfy and Jan Saxl. On the number of p-regular elements in ﬁnite simple groups. LMS J. Comput. Math. 12, 82–119, 2009. ´ [10] L´ aszl´o Babai, Robert Beals and Akos Seress. Polynomial-time Theory of Matrix Groups. In Proceedings of the 41st Annual ACM Symposium on Theory of Computing, STOC 2009, Bethesda, MD, USA, pages 55–64, 2009. O’Brien: Algorithms for matrix groups 319 [11] Henrik B¨ aa¨rnhielm. Algorithmic problems in twisted groups of Lie type.

P. Glasby and Cheryl E. Praeger. Towards an eﬃcient Meat-axe algorithm using f -cyclic matrices: The density of uncyclic matrices in M(n, q). J. Algebra 322, 766– 790, 2009. [50] Daniel Gorenstein, Richard Lyons and Ronald Solomon. The classiﬁcation of the ﬁnite simple groups. Number 3. American Mathematical Society, Providence, RI, 1998. [51] Robert Guralnick, Tim Penttila, Cheryl E. Praeger and Jan Saxl. Linear groups with orders having certain large prime divisors. Proc. London Math. Soc. 78, 167–214, 1999.

Xk , t | xt1 = φ(x1 ), . . , xtk = φ(xk ) for some injective endomorphism φ of Fk . For example, HT = x, y, t | txt−1 = xy, tyt−1 = yx , so the endomorphism φ is given by φ : x → xy, y → yx. Sapir: Residual properties of 1-relator groups 334 It is easy to see that every element in G has the form tk w(x1 , . . , xk )tl . If k +l = 0, then the element survives the homomorphism xi → 0, t → 1, G → Z. Hence we can assume that k + l = 0, and the element is conjugate to w(x1 , . . , xk ). Thus it is enough to consider elements from Fk only.