repetition
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Terminating Decimal
3.14 has a finite number of digits. All numbers with a finite number of digits are rational. Pi has an infinite number of digits, AND the digits don't repeat in a regular pattern. (Numbers with repeating decimals are rational as well.)
I believe you are asking about the vinculum, and it is used to indicate one or more digits that repeat their pattern forever.
Not sure about a demial, but the number is called a repeating or recurring decimal.
Not sure about a demial, but the number is called a repeating or recurring decimal.