The Pi and others alphabet

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