disciplines             Mathematical discipline IDs
get_genealogy           Retrieve genealogy tree by mathematician ID
plot_gg                 Plot genealogical tree with 'ggenealogy'
plot_gg_path            Plot shortest path in genealogical tree with
                        'ggenealogy'
plot_grviz              Plot genealogical tree with Graphviz
search_id               Search for mathematician in Mathematics
                        Genealogy Project
