Across
- 4. A word or phrase used as an aid to memory.
- 6. A principle or statement that can be demonstrated or proved using axioms
- 7. A starting assumption, often regarded as a self-evident truth
- 8. Conclusive evidence
Down
- 1. Firm conviction that something is the case.
- 2. Something is not made up of matter; it has no physical mass
- 3. A tiny amount of something
- 5. A procedure which is done because people have agreed to do it that way