crosswordie

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Across
  1. 1. Musical lead-in to series or mean
  2. 6. Literary repetition
  3. 7. Literary device using two senses of a word in combination
  4. 9. 3-in-1 note package, say
  5. 15. Coordinate system involving a radius and an angle
  6. 16. Feature of 1/x and tan x
  7. 18. Pair with delta, regarding functions
  8. 19. Man who helped discover eponymous law regarding light efficiency
  9. 22. Fermat's not-last exponent, maybe
  10. 23. Calil, tsyhtema, or atnegam, with some wordplay
  11. 25. Pointed arch type archetype?
  12. 27. Currency
  13. 28. One of two triangle middles involving a circle
Down
  1. 2. Polynomial nullifier
  2. 3. A law relating two forms of composition, categorically
  3. 4. Rapid alternation of nearby notes
  4. 5. Technique to generate text by looking at what words/chunks of letters are likely to follow, for example
  5. 8. Chord roll
  6. 10. Dragonfruit
  7. 11. One who made a point of contact triangles
  8. 12. With "expected," an average result of a function
  9. 13. Regularly consumed psychoactive stimulant
  10. 14. Creator of a cyclic inequality involving a/(b+c)
  11. 17. Smallest positive prime
  12. 20. "Ghostlike" particle passing through everyone constantly
  13. 21. An increasing family of function decreasing in speed of increase
  14. 24. Maker of a theorem placing P and Q on each other's polars
  15. 26. Chord with C, F, and G, maybe
  16. 27. Categorical injective equivalent