Constructive homomorphisms for classical groups

Scott Murray, Colva Roney-Dougal

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    Let be a quasisimple classical group in its natural representation over a finite vector space , and let . We construct the projection from to and provide fast, polynomial-time algorithms for computing the image of an element. Given a discrete logarithm oracle, we also represent as a group with at most 3 generators and 6 relations. We then compute canonical representatives for the cosets of . A key ingredient of our algorithms is a new, asymptotically fast method for constructing isometries between spaces with forms. Our results are useful for the matrix group recognition project, can be used to solve element conjugacy problems, and can improve algorithms to construct maximal subgroups.
    Original languageEnglish
    Pages (from-to)371-384
    Number of pages14
    JournalJournal of Symbolic Computation
    Publication statusPublished - 2011


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