Add a solid dot directly above the first and last numbers in the loop section. The symbol of infinite loop is as follows:

I. Infinitely cyclic decimals

The decimal part of a number, with irregular arrangement and infinite digits, is called infinite acyclic decimal.

Second, infinite cyclic decimals

In the decimal part of a number, one number or several numbers appear repeatedly in turn, and this number is called cyclic decimal. For example: 3.555 … 0.0333 …12.15438+009 …

Third, finite decimals

The number of digits in the decimal part is a finite decimal, which is called a finite decimal. For example, 4 1.7, 25.3 and 0.23 are all finite decimals.

Infinite symbol (∞), infinite or infinite, means "unbounded". It has different concepts in theology, philosophy, mathematics and daily life. Usually the use of this word does not involve its more professional definition.

In mathematics, two equations with infinite symbols are occasionally used, namely: ∞=∞+ 1, ∞=∞× 1.

A formula in which positive values represent infinity. There is no specific number, but positive infinity means a value greater than any number. The symbol is+∞, so is the symbol of negative infinity-∞.