Puzzle #47 (Maths)

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Across
  1. 3. number - a number of the form a + bi, where a and b are real numbers and i is the imaginary unit
  2. 4. - a mathematical object that has repeating patterns at different scales
  3. 5. - a positive integer greater than 1 that is only divisible by 1 and itself
  4. 6. - a collection of distinct objects, called elements, considered as a single object
  5. 9. - a unit of measurement for angles, equal to the angle formed at the center of a circle by two radii that cut off on the circumference an arc equal in length to the radius
Down
  1. 1. - a mathematical statement that asserts the relative size or ordering of two values.
  2. 2. - the absolute value of a number, or the distance between a number and zero on a number line
  3. 5. - a mathematical constant that represents the ratio of a circle's circumference to its diameter
  4. 7. number - a mathematical constant that is the base of the natural logarithm
  5. 8. - a mathematical expression consisting of variables and coefficients, which are combined using only the operations of addition, subtraction, and multiplication