Numbers and Concepts

Across

1. Without any limits or end

3. Musical term meaning very fast tempo

6. Number after seven and before nine

9. Element contributing to a result

12. Number after six and before eight

13. Unusual occurrence defying expectations

Down

2. Group of twelve items together

4. Measurement from end to end

5. Order of events or numbers

7. Third letter of the Greek alphabet

8. Place for live stage performances

10. Small wave on water surface

11. Starting point in counting or value