| English | eng-000 |
| theory-based | |
| English | eng-000 | academic |
| English | eng-000 | doctrinaire |
| English | eng-000 | mathematical |
| English | eng-000 | notional |
| English | eng-000 | pure |
| English | eng-000 | speculative |
| English | eng-000 | theoretic |
| English | eng-000 | theoretical |
| suomi | fin-000 | teoreettinen |