and 
| basic_letter | A basic_letter is an element of an alphabet |
| Bsum | Bsums arise from Hoelder convolutions |
| classical_polylog | A classical polylog is a special case of a Nielsen polylog |
| Csum | Csums involve a conjugation |
| Euler_Zagier_sum | A Euler-Zagier sum is a special case of a Zsum |
| expand_request | Flags for the nestedsum_helper_expand function |
| expand_status | Flags for the status of the expansion |
| harmonic_polylog | A harmonic polylog is a special case of a multiple polylog |
| harmonic_sum | A harmonic sum is a special case of a Ssum |
| harmonic_sum_to_Infinity | |
| hash_entry | This class provides a container for expressions to be stored in hash tables |
| letter | A letter is a basic_letter with offset=0 |
| list_of_tgamma | The class list_of_tgamma is a container for the class ratio_of_tgamma |
| multiple_polylog | A multiple polylog sum is a special case of a Zsum |
| multiple_zeta_value | |
| nestedsums_status_flags | Additional status flags |
| nielsen_polylog | A Nielsen polylog is a special case of a harmonic polylog |
| print_format | Flags for the print format for polylogs |
| ratio_of_tgamma | The class ratio_of_tgamma contains the ratio of two Gamma functions |
| root_of_unity | |
| Ssum | Ssums form an algebra |
| Ssum_to_Infinity | A Ssum_to_Infinity is a special case of a Ssum |
| transcendental_fct_type_A | |
| transcendental_fct_type_B | |
| transcendental_fct_type_C | |
| transcendental_fct_type_D | |
| transcendental_sum_type_A | |
| transcendental_sum_type_B | The class transcendental_sum_type_B may contain and |
| transcendental_sum_type_C | The class transcendental_sum_type_C involves a conjugation |
| transcendental_sum_type_D | |
| unit_letter | A unit_letter is a letter whose letter content equals 1 |
| Zsum | Zsums form a Hopf algebra |
1.3.7