The Pi and others alphabet

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