The Pi and others alphabet

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Across
  1. 4. Fifth letter of the Greek alphabet, a small positive quantity
  2. 8. Eleventh letter of the Greek alphabet, von Mangoldt function in mathematical number theory.
  3. 9. Fifteenth letter of the Greek alphabet, The big-O symbol was introduced by Paul Bachmann and popularized by Edmund Landau, originally standing for "order of"
  4. 13. is the Ninth letter of the Greek alphabet, The golden ratio, although φ is more common
  5. 14. Twelfth letter of the Greek alphabet, the SI prefix micro- which represents one millionth
  6. 15. Sixteenth letter of the Greek alphabet, the ratio of a circle's circumference to its diameter in Euclidean geometry.
  7. 16. First letter of the Greek alphabet, thermal expansion coefficient
  8. 17. Fourth letter of the Greek alphabet, 1/2absinC
  9. 18. Fourteenth letter of the Greek alphabet, The "cascade particles" in particle physics
  10. 19. Twenty-Third letter of the Greek alphabet, the reciprocal Fibonacci constant, the division polynomials, and the super golden ratio.
  11. 21. Twenty-Fourth letter of the Greek alphabet, Chaitin's constant.
  12. 22. Seventh letter of the Greek alphabet, the elasticity in economics
Down
  1. 1. Seventeenth letter of the Greek alphabet, Densities: mass density, air density or charge density
  2. 2. Second letter of the Greek alphabet, the proton-to-electron mass ratio
  3. 3. Eighteenth letter of the Greek alphabet, a type of algebra of sets known as σ-algebra
  4. 5. Third letter of the Greek alphabet, the chromatic number of a graph theory
  5. 6. Nineth letter of the Greek alphabet, the English phrase "not the slightest amount"
  6. 7. Sixth letter of the Greek alphabet, damping ratio
  7. 10. Twenty-Second letter of the Greek alphabet, x^2 has various uses, including the x-squared distribution, the x-squared test, and x-squared target models.
  8. 11. Thirteenth letter of the Greek alphabet, the degree of freedom in statistics
  9. 12. Twentieth letter of the Greek alphabet, A similar symbol is used for the astrological sign of Aries.
  10. 15. Twenty-First letter of the Greek alphabet, Common known as the golden ratio
  11. 20. Tenth letter of the Greek alphabet, A famous Japanese folklore mermaid
  12. 23. Eighth letter of the Greek alphabet, a plane angle in geometry