Japanese
Sequence

  1. Sequence
    1. Natural Number and Sequence
    2. Realization of Sequence
    3. "0, 1, 2, . . . ."
    4. n-ry number notation
    5. Order Relation on the Sequence

  2. Counting
    1. Counting
    2. Decimal Counting

  3. Identification Number
    1. Identification Number
    2. Ordering Number