Functions of single and two variable

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Across
  1. 2. value of a function
  2. 3. value of a function
  3. 6. of finding best solution
  4. 7. of maximum increase
  5. 9. of change of a function
  6. 10. of all possible input values
  7. 12. of all output values
  8. 16. of a function without sudden break
  9. 17. of single variable function
  10. 18. graph of two variable function
  11. 19. of second order derivatives
  12. 20. with more than one variable
Down
  1. 1. having only one optimum
  2. 4. approached by a function
  3. 5. quantity whose value can change
  4. 8. joining equal function values
  5. 11. produced by function
  6. 13. relation that maps input to output
  7. 14. given to a function
  8. 15. used for multivariable functions