08Bxx | 08A | 08 | 08C |
| 08B05 | Equational logic, Malcev (Maltsev) conditions |
| 08B10 | Congruence modularity, congruence distributivity |
| 08B15 | Lattices of varieties |
| 08B20 | Free algebras |
| 08B25 | Products, amalgamated products, and other kinds of limits and colimits [See also 18A30] |
| 08B26 | Subdirect products and subdirect irreducibility |
| 08B30 | Injectives, projectives |
| 08B99 | None of the above, but in this section |