Math Cross Word Puzzle

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Across
  1. 2. A quantity that may assume any one of a set of values
  2. 3. A numerical representation indicating the quotient of two numbers
  3. 5. The limit of the ratio of the change in a function to the corresponding change in its independent variable as the latter change approaches zero
  4. 7. Extending in the same direction, everywhere equidistant, and not meeting
  5. 10. A number that has a fixed value in a given situation or universally or that is characteristic of some substance or instrument
  6. 11. A formula, proposition, or statement in mathematics or logic deduced or to be deduced from other formulas or propositions
  7. 13. A branch of mathematics dealing with the collection, analysis, interpretation, and presentation of masses of numerical data
  8. 14. Equally distant
  9. 15. The ratio of the number of outcomes in an exhaustive set of equally likely outcomes that produce a given event to the total number of possible outcomes
  10. 17. A symbol written above and to the right of a mathematical expression to indicate the operation of raising to a power
  11. 18. The study of the properties of triangles and trigonometric functions and of their applications
  12. 19. Any of the natural numbers, the negatives of these numbers, or zero
Down
  1. 1. The perimeter of a circle
  2. 4. A method of computation or calculation in a special notation (as of logic or symbolic logic)
  3. 6. Any equation containing one term in which the unknown is squared and no term in which it is raised to a higher power
  4. 8. The figure formed by two lines extending from the same point
  5. 9. The exponent that indicates the power to which a base number is raised to produce a given number
  6. 12. A usually formal statement of the equality or equivalence of mathematical or logical expressions
  7. 16. A branch of mathematics that deals with the measurement, properties, and relationships of points, lines, angles, surfaces, and solids