Across
- 1. Phase blended into a form (5)
- 3. Strange cat burst to make less (8)
- 5. Whole number within enceinte German (7)
- 6. Mean about 501 is the middle (6)
- 9. Dial about argon minus radical joining opposite vertices (8)
- 11. An american following a reversing taxi? Can be counted upon. (6)
- 13. It is very small, I have hidden it in semifinal (13)
- 16. Meatiest mix is my rough guess (8)
- 17. Fish in tangled line creates measurement (5)
- 18. Side of right triangle crashed phoney utes (10)
- 19. First Minister is neither composite nor one (5)
Down
- 2. Damaged unpriced pearl stands upright (13)
- 4. Sequence in pitter-patter not downpour (7)
- 7. Mixing gun tonic finding the total number (8)
- 8. Noted actor divides a number (6)
- 10. Boundary of shifting empire followed by waterless terrain (9)
- 11. Basic mathematics sounds like a rhythmic tick (10)
- 12. Novel iconic, fab eponymous series (9)
- 14. Foremost, each quantities usually are level (5)
- 15. Confusing grey tome reveals a branch of mathematics (8)