Trac #14772: Remove CombinatorialClass from Permutations.
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trac #14772: review patch (dg)
Trac #12142: finite fields using PARI's FFELT type
Trac #12142: convert finite field elements from and to Singular
Trac #12142: add doctest
Trac #12142: replace __cinit__ (Cython constructor) by a comment
Trac #14366: 0 in 0 ideal
Trac #9466: all square roots of non-square elements
Trac #14382: Fix phantom spaces in LaTeX code of strings.
Trac #14906: Implement expand_as_sf method for CycleIndexSeries
Trac #14853: bug in graphs.base.c_graph.get_vertex
Trac #14542: Implement arithmetic product of cycle index series
Trac #14542: review patch
Trac #11861: Unifies both functions.
Trac #11861: review patch
Trac #7424: psl of finite fields
Trac #14997: i) remove redundant lines from shortened()
ii) speed up punctured()
Trac #14900: documentation of modular symbols
Trac #15026: Fix wrong except clauses
Trac #15032: real and imag of complex should be real
Trac #15009: formatting of references