319 ريض

sets
-  Natural numbers:
          Cardinal Numbers: Counting numbers.
          Ordinal Numbers: Numbers that tell order.
          Nominal Numbers: Numbers that are used to name or
                                           identify.
          Digits: The numbers 0 – 9, which can be combined in different
                      ways to write any number.
         Place: Value The value of a digit based on its position in a
                     number.
        Fraction: A number that represents a part of a whole.
- algebra of logic operations
- open sentences