crossword

123456789
Across
  1. 3. numbers from 1 to infinity
  2. 4. the science of numbers, quantitative relations, and spatial forms
  3. 6. adding or subtracting this number will not change the result.
  4. 8. the branch of mathematics that studies spaces
  5. 9. numerical characterization of a two-dimensional geometric shape that shows the size of this shape
Down
  1. 1. mathematical statement, the truth of which is established by proof
  2. 2. The statement is accepted as true without the need for proof
  3. 3. you can perform various operations with them
  4. 5. scientific assumption put forward to explain any phenomena and requiring verification, confirmation by experience
  5. 7. the branch of mathematics that studies numbers