Math Investigation eTwinning. Mission: Infinity...Affairs! Volume: Infinity | Page 24

Across
2. The cardinality of the real numbers is the next bigger cardinality after the
cardinality of the natural numbers.
5. The mathematician who discovered the existence of unprovable statements like
the continuum hypothesis
11. Coming after all others in time or order; final.
12. The number of elements in a set, whether the set is finite or infinite.
Note: Not all infinite sets have the same cardinality.
14. A positive integer which has only 1 and the number itself as factors. For
example, 2, 3, 5, 7, 11, 13, etc.
17. Two times; on two occasions.
19. An attribute, quality, or characteristic of something.
22. The German mathematician who tried to explain some of the properties of
infinity using a hotel with infinitely many rooms.
26. Extend over so as to cover partly. You can say, for example: ‘the curtains
overlap at the centre when closed’.
28. A group of numbers, variables, geometric figures, or just about anything.
29. On one occasion or for one time only.
34. A statement that cannot be proved.
35. The result of raising a base to an exponent.
36. Coming immediately after the previous one.
37. All positive and negative whole numbers (including zero). That is, the set
{... , –3, –2, –1, 0, 1, 2, 3, ...}.
38. A "number" which indicates a quantity, size, or magnitude that is larger
than any real number.
42. An arithmetical value, expressed by a word, symbol, or figure, representing
a particular quantity and used in counting and making calculations.
43. The numbers used for counting. That is, the numbers 1, 2, 3, 4, etc.
46. Containing or holding as much or as many as possible; having no empty space.
48. Proving a conjecture by assuming that the conjecture is false. If this
assumption leads to a contradiction, the original conjecture must have been
true.
49. The part of a conditional after If and before then.
51. Straight up and down. As an example, we can consider a wall.
52. The first mathematician to realize that there are different kinds, different
sizes of infinity.
53. Describes a set which does not have an infinite number of elements. That is,
a set which can have its elements counted using natural numbers. Formally, a set
is finite if its cardinality is a natural number.
54. A mark or character used as a conventional representation of an object,
function, or process, e.g. the letter or letters standing for a chemical element
or a character in musical notation.
55. Writing an integer as a product of powers of prime numbers.

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LYKEIO SCHIMATARIOY, GREECE

- VALLAURI FOSSANO, ITALY

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