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# QQi -- the class of all rational intervals

## Description

This class is similar to the class of real intervals, except that the boundaries are arbitrary precision rational numbers.

## Caveat

Currently this class is not implemented in the interpreter, which means rings or matrices over rational intervals are not supported, and many functionalities of RRi are not yet available.

## Methods that use a rational interval:

- diameter(QQi) (missing documentation)
- interval(QQi) (missing documentation)
- lift(QQi,type of Number) (missing documentation)
- Number == QQi (missing documentation)
- precision(QQi) (missing documentation)
- promote(Number,type of QQi) (missing documentation)
- QQi == Number (missing documentation)
- ring(QQi) (missing documentation)

## For the programmer

The object QQi is a ring, with ancestor classes List < VisibleList < BasicList < Thing.

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/Msolve.m2:644:0.